Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 70,589 $ 224,785 $ 32,662
Other comprehensive income (loss):      
Change in pension and postretirement obligations, net of tax (141) 82 (73)
Total other comprehensive income (loss), net of tax (141) 82 (73)
Comprehensive income $ 70,448 $ 224,867 $ 32,589