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Income Taxes Effective Tax Rate Reconciliation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Tax Rate Reconciliation [Abstract]      
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority   $ 92,000,000 $ 36,619,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ (187,218,000) $ (166,497,000) $ 63,053,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Amount $ (18,960,000) $ (29,526,000) $ (42,302,000)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depletion, Percent 3.50% 6.20% (23.50%)
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount $ 0 $ 0 $ 1,235,000
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Percent (0.00%) (0.00%) 0.70%
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount $ (6,789,000) $ 13,576,000 $ (8,331,000)
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent 1.30% (2.90%) (4.60%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount $ 36,619,000 $ (36,000) $ (5,248,000)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent (6.80%) 0.00% (3.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount $ (25,629,000) $ (10,109,000) $ 5,235,000
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Percent 4.80% 2.10% 2.90%
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount $ 20,047,000 $ 39,492,000 $ (1,436,000)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent (3.70%) (8.30%) (0.80%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount $ 187,759,000 $ 25,903,000 $ 0.000
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent (35.10%) (5.00%)  
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount $ 1,966,000 $ 964,000 $ 1,411,000
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent (0.40%) 0.20% (1.00%)
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount $ 2,215,000 $ 794,000 $ 4,057,000
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent (0.50%) 0.20% (2.10%)
Income Tax Expense (Benefit) $ 10,010,000 $ (125,439,000) $ 15,204,000
Effective Income Tax Rate Reconciliation, Percent (1.90%) 26.30% 8.30%