Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details)

v3.21.1
Accumulated Other Comprehensive Income - Reclassifications out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Derivatives            
Interest expense $ 7,233   $ 9,613   $ 14,961 $ 18,853
Income before income tax 6,124   (97,661)   8,112 (113,364)
Income taxes (972)   11,066   (4,952) 16,463
Net income (loss) 5,152 $ (1,992) (86,595) $ (10,306) 3,160 (96,901)
Prior service credit            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Income before income tax 132   70   240 140
Actuarial losses            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Income before income tax (3,023)   (2,386)   (6,044) (4,773)
Post-retirement benefit plans            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Income before income tax (2,891)   (2,316)   (5,804) (4,633)
Net income (2,255)   (1,827)   (4,379) (3,554)
Derivatives            
Income taxes (636)   (489)   (1,425) (1,079)
Derivatives            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Net income (567)   137   (1,249) 412
Derivatives | Reclassification out of Accumulated Other Comprehensive Income            
Derivatives            
Income before income tax (751)   182   (1,654) 546
Income taxes 184   (45)   405 (134)
Net income (loss) (567)   137   (1,249) 412
Derivatives | Interest rate swap contracts | Reclassification out of Accumulated Other Comprehensive Income            
Derivatives            
Interest expense $ (751)   $ 182   $ (1,654) $ 546