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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 1,826,656 | $ 1,510,354
Equity compensation | 36,972 | 37,633
Deferred revenue | 31,082 | 19,422
Tax credit and other attribute carryforwards | 91,680 | 119,471
Insurance loss reserve | 5,118 | 6,192
Accrued interest | 357,285 | 288,687
Other | 115,909 | 135,185
Subtotal | 2,464,702 | 2,116,944
Valuation allowance | (1,807,728) | (1,560,162)
Deferred tax assets | 656,974 | 556,782
Deferred tax liabilities: |  |
Depreciation, amortization for tax in excess of book expense | 288,086 | 384,513
Variable interest investments | 641 | 718
Other | 11,154 | 16,009
Deferred tax liability | 299,881 | 401,240
Net deferred tax assets | 357,093 | 155,542
Balance Sheet Summary : |  |
Net noncurrent deferred asset | 366,588 | 184,868
Net current deferred liability | (9,495) | (29,326)
Net noncurrent deferred liability | $ (9,495) | $ (29,326)

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