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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 1,974,658 | $ 1,826,656
Equity compensation | 10,281 | 36,972
Deferred revenue | 14,005 | 31,082
Tax credit and other attribute carryforwards | 131,640 | 91,680
Insurance loss reserves | 6,626 | 5,118
Accrued interest | 234,033 | 357,285
Other | 80,492 | 115,909
Subtotal | 2,451,735 | 2,464,702
Valuation allowance | (1,869,490) | (1,807,728)
Deferred tax assets | 582,245 | 656,974
Deferred tax liabilities: |  |
Depreciation and amortization for tax in excess of book expense | 146,448 | 288,088
Variable interest investments |  | 641
Other | 27,132 | 11,154
Deferred tax liability | 173,580 | 299,883
Net deferred tax assets (liabilities) | 408,665 | 357,091
Balance Sheet Summary : |  |
Net noncurrent deferred tax asset (1) | 419,003 | 366,586
Net noncurrent deferred tax liability | $ (10,338) | $ (9,495)

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