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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 2,834,851 | $ 1,967,910
Equity compensation | 6,577 | 7,038
Deferred revenue | 8,873 | 16,494
Tax credit and other attribute carryforwards | 97,215 | 100,752
Insurance loss reserves | 2,248 | 2,451
Accrued interest | 172,120 | 206,088
Other | 95,588 | 82,167
Subtotal | 3,217,472 | 2,382,900
Valuation allowance | (2,813,567) | (1,917,390)
Deferred tax assets | 403,905 | 465,510
Deferred tax liabilities: |  |
Depreciation and amortization for tax in excess of book expense | 80,155 | 102,810
Other | 21,055 | 23,920
Deferred tax liability | 101,210 | 126,730
Net deferred tax assets (liabilities) | 302,695 | 338,780
Balance Sheet Summary : |  |
Deferred income taxes | 305,844 | 345,091
Net noncurrent deferred tax liability | $ (3,149) | $ (6,311)

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