Quarterly report pursuant to Section 13 or 15(d)

Share Based Payments (Details)

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Share Based Payments (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Share-based compensation, aggregate disclosures [Abstract]    
Total stock-based compensation cost $ 1,412 $ 1,757
Future income tax benefit from compensation expense recognized 551 685
Cash received from stock options exercised 28 153
Tax benefit realized from options exercised 3 51
2007 Equity Incentive Plan [Member]
    
Share-based compensation, aggregate disclosures [Abstract]    
Term of plan (in years) 10  
Maximum number of shares available for grants or awards (in shares) 2,200,000  
Shares reserved for future issuance under award plan (in shares) 815,152  
Restricted Stock [Member]
    
Share-based compensation, aggregate disclosures [Abstract]    
Vesting rights With respect to outstanding restricted share grants, generally one-half of the shares vest on the third anniversary of the grant. The remaining one-half of the shares vest in one-third increments upon attainment of pre-defined levels of appreciation in the market value of the Company's Class A Common Stock. Additionally, restricted shares cannot vest until the first anniversary of the grant date.  
Award expiration Unvested restricted shares generally expire on the earlier of five years from the date of grant, upon employment termination, or within specified time limits following voluntary employment termination (with the consent of the Company), retirement or death.  
Restricted stock activity [Roll Forward]    
Non-vested at beginning of period (in shares) 541,613  
Granted (in shares) 154,710  
Vested (in shares) (146,260)  
Expired or forfeited (in shares) (400)  
Non-vested at end of period (in shares) 549,663  
Non-vested weighted-average grant-date fair value, beginning of period (in dollars per share) $ 33.62  
Granted, weighted-average grant-date fair value (in dollars per share) $ 32.08  
Vested, weighted-average grant-date fair value (in dollars per share) $ 35.55  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) $ 31.45  
Non-vested weighted-average grant-date fair value, end of period (in dollars per share) $ 32.68  
Non-vested options activity [Roll Forward]    
Expired or forfeited (in shares) (400)  
Unrecognized compensation cost [Abstract]    
Unrecognized compensation cost on non-vested awards 6,842  
Weighted average period of recognition of unrecognized compensation cost on non-vested awards (in years) 1.8  
Fair value assumptions [Abstract]    
Expected volatility (in hundredths) 30.40% 30.00%
Dividend yield (in hundredths) 1.00% 1.00%
Average risk free interest rate (in hundredths) 0.90% 1.20%
Weighted average expected term (in years) 2.0 2.0
Stock Options [Member]
    
Share-based compensation, aggregate disclosures [Abstract]    
Vesting rights Outstanding stock options are generally exercisable in one-third increments upon the attainment of pre-defined levels of appreciation in the market value of the Company's Class A Common Stock. In addition, options generally vest in one-third increments after three, four and five years, respectively, from the grant date (but, in any event, not until the attainment of the market value thresholds).  
Award expiration The options expire on the earlier of ten years from the date of grant, upon employment termination, or within specified time limits following voluntary employment termination (with the consent of the Company), retirement or death.  
Restricted stock activity [Roll Forward]    
Expired or forfeited (in shares) (7,083)  
Stock option activity [Roll Forward]    
Outstanding, beginning of period (in shares) 872,514  
Granted (in shares) 0  
Exercised (in shares) (1,166)  
Expired or forfeited (in shares) (7,750)  
Outstanding, end of period (in shares) 863,598  
Exercisable (in shares) 503,095  
Outstanding, weighted-average exercise price, beginning of period (in dollars per share) $ 37.02  
Granted, weighted-average exercise price (in dollars per share) $ 0  
Exercised, weighted-average exercise price (in dollars per share) $ 24.37  
Expired or forfeited, weighted-average exercise price (in dollars per share) $ 40.63  
Outstanding, weighted-average exercise price, end of period (in dollars per share) $ 37.01  
Exercisable, weighted-average exercise price (in dollars per share) $ 35.78  
Outstanding, weighted-average remaining contractual term (in years) 3.8  
Outstanding, aggregate intrinsic value 0  
Exercisable, weighted-average remaining contractual term (in years) 3.5  
Exercisable, aggregate intrinsic value 0  
Non-vested options activity [Roll Forward]    
Non-vested at beginning of period (in shares) 367,586  
Granted (in shares) 0  
Vested (in shares) 0  
Expired or forfeited (in shares) (7,083)  
Non-vested at end of period (in shares) 360,503  
Non-vested, weighted-average grant-date fair value, beginning of period (in dollars per share) $ 11.38  
Granted, weighted-average grant-date fair value (in dollars per share) $ 0  
Vested, weighted-average grant-date fair value (in dollars per share) $ 0  
Expired or forfeited, weighted-average grant-date fair value (in dollars per share) $ 12.28  
Non-vested, weighted-average grant-date fair value, end of period (in dollars per share) $ 11.36  
Director Fee Plan [Member]
    
Share-based compensation, aggregate disclosures [Abstract]    
Maximum number of shares available for grants or awards (in shares) 300,000  
Director Fee Plan, aggregate disclosures [Abstract]    
Annual retainer fee paid to non-employee directors 60  
Annual retainer fee paid to non-employee Chairman of the Board 130  
Shares deferred under the Director Fee Plan (in shares) 14,794  
Value of annual stock-based grant $ 80  
Total stock options granted to date (in shares) 22,300  
Option awards outstanding and vested (in shares) 11,800  
Total restricted stock awards granted to date (in shares) 64,923  
Restricted stock awards unvested (in shares) 23,623