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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]          
Net income (loss) $ (15,139) $ (16,163) $ (252,415) $ (59,310) $ 126,474
Other comprehensive income (loss) before income tax effect:          
Foreign currency cash flow hedges reclassified to net income (loss) (46) (46) 4,295 (186) (186)
Defined benefit plans and other postretirement benefits:          
Net gain (loss) arising during the period     (9,522) 5,553 (41,995)
Prior service benefit arising during the period     0 1,758 (1,299)
Amortization of prior service benefit during the period (311) (667) (2,675) (8,351) (3,504)
Amortization of net loss during the period 2,143 1,919 8,190 7,794 10,312
Other comprehensive income (loss) before income tax effect 1,786 1,206 288 6,568 (36,672)
Income tax effect (1,074) (383) (1,531) (1,536) (1,829)
Other comprehensive income (loss) 712 823 (1,243) 5,032 (38,501)
Total comprehensive income (loss) $ (14,427) $ (15,340) $ (253,658) $ (54,278) $ 87,973