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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net loss $ (175,887) $ (168,103) $ (382,589) $ (281,298)
Derivative instruments        
Comprehensive income (loss) before tax (162) (3,199) (386) 1,846
Income tax benefit (provision) 0 1,153 81 (664)
Derivatives qualifying as hedges, adjustment, net of tax (162) (2,046) (305) 1,182
Pension, postretirement and other post-employment benefits        
Comprehensive income (loss) before tax (2,749) 3,474 (4,087) 3,768
Income tax benefit (provision) 0 (1,252) 481 (1,357)
Pension and other postretirement benefit plans, adjustment, net of tax (2,749) 2,222 (3,606) 2,411
Available-for-sale securities        
Comprehensive income (loss) before tax 504 68 3,407 359
Income tax benefit (provision) 0 (28) (1,043) (132)
Available-for-sale securities adjustment, net of tax 504 40 2,364 227
Total other comprehensive income (loss) (2,407) 216 (1,547) 3,820
Total comprehensive loss $ (178,294) $ (167,887) $ (384,136) $ (277,478)