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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 3,676,333 | $ 3,618,227
Equity compensation | 822 | 1,594
Deferred revenue | 775 | 3,878
Tax credit and other attribute carryforwards | 84,624 | 84,502
Insurance loss reserves | 2,909 | 2,086
Depreciation and amortization for tax in excess of book expense | 118,151 | 44,837
Other | 131,223 | 110,003
Subtotal | 4,014,837 | 3,865,127
Valuation allowance | (3,754,207) | (3,602,144)
Deferred tax assets | 260,630 | 262,983
Deferred tax liabilities: |  |
Other | 4,772 | 17,388
Deferred tax liability | 4,772 | 17,388
Net deferred tax assets (liabilities) | 255,858 | 245,595
Balance Sheet Summary : |  |
Net noncurrent deferred tax asset | 258,631 | 247,171
Net noncurrent deferred tax liability | (2,773) | (1,576)
Net deferred tax asset (liability) | $ 255,858 | $ 245,595

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