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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 3,618,227 | $ 2,834,851
Equity compensation | 1,594 | 6,577
Deferred revenue | 3,878 | 8,873
Tax credit and other attribute carryforwards | 84,502 | 97,215
Insurance loss reserves | 2,086 | 2,248
Accrued interest |  | 172,120
Depreciation and amortization for tax in excess of book expense | 44,837 |
Other | 110,003 | 95,588
Subtotal | 3,865,127 | 3,217,472
Valuation allowance | (3,602,144) | (2,813,567)
Deferred tax assets | 262,983 | 403,905
Deferred tax liabilities: |  |
Depreciation and amortization for tax in excess of book expense |  | 80,155
Other | 17,388 | 21,055
Deferred tax liability | 17,388 | 101,210
Net deferred tax assets (liabilities) | 245,595 | 302,695
Balance Sheet Summary : |  |
Deferred income taxes | 247,171 | 305,844
Net noncurrent deferred tax liability | $ (1,576) | $ (3,149)

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