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Reportable Segments - Reconciliation of Net Income to Gross Margin (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reconciliation Net Income (Loss) to Gross Margin        
Income (loss) before income taxes $ 110,926 $ 127,997 $ 225,680 $ 257,414
Less:        
Selling, general and administrative 28,080 31,357 62,731 63,925
Depreciation and amortization 51,896 57,539 105,823 114,552
Long-lived asset impairment 13,808 9,510 23,668 17,663
Restructuring and other charges 3,004 1,193 11,069 1,193
Interest expense 21,177 28,079 41,477 54,870
Other income, net (181) (2,482) (2,170) (3,032)
Income (loss) before income taxes $ (6,858) $ 2,801 $ (16,918) $ 8,243