Quarterly report pursuant to Section 13 or 15(d)

Pension and Other Postretirement Benefit Plans - Narrative (Details)

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Pension and Other Postretirement Benefit Plans - Narrative (Details)
$ in Thousands
3 Months Ended
Jun. 30, 2017
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
Required plan contributions $ 5,110