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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
State tax effected net operating losses |  |  |  |
Deferred tax adjustment related to change in overall state tax rate | $ (663) | $ 2,822 | $ (86,956) |
Alternative minimum tax credits | 218,773 | 228,693 |  |
Tax benefits related to employee stock-based compensation not reflected in deferred tax assets | 120,300 |  |  |
Additions based on tax provisions related to the current year | 0 | 0 | 0 |
Reductions for tax positions of prior years | 0 | 0 | 3,037 |
Unrecognized tax benefits | 663 | $ 663 | $ 663 | $ 3,700
Federal |  |  |  |
State tax effected net operating losses |  |  |  |
Net operating loss carryforwards | 1,000,000 |  |  |
State Tax Reporting |  |  |  |
State tax effected net operating losses |  |  |  |
Net operating loss carryforwards | 636,100 |  |  |
Valuation allowance on operating loss carryforwards | $ 4,800 |  |  |

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