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Income Taxes Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 39,850 | $ 25,903 |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 219,872 | 143,122 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 305 | 53 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 252 | 53 |
Deferred Tax Assets, Valuation Allowance, Noncurrent | 60,488 | 42,983 |
Valuation Allowance, Deferred Tax Asset, Change in Amount | 10,591 | 9,420 |
Current Federal Tax Expense (Benefit) | (103,562) | 19,726 | $ 18,388
Current State and Local Tax Expense (Benefit) | (8,699) | (5,657) | 2,724
Current Foreign Tax Expense (Benefit) | 1,966 | 964 | 1,411
Current Income Tax Expense (Benefit) | (110,295) | 15,033 | 22,523
Deferred Federal Income Tax Expense (Benefit) | 124,766 | (181,859) | (12,581)
Deferred State and Local Income Tax Expense (Benefit) | (4,461) | 41,387 | 5,262
Deferred Income Tax Expense (Benefit) | 120,305 | (140,472) | (7,319)
Income Tax Expense (Benefit) | 10,010 | $ (125,439) | $ 15,204
Charitable Contributions [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Noncurrent | 5,051 |  |
Alternative Minimum tax credit [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Noncurrent | $ 166,798 |  |

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