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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred income tax assets: |  |
Operating lease obligations | $ 322,122 | $ 406,172
Financing lease obligations | 90,011 | 156,913
Operating loss carryforwards | 237,728 | 330,983
Accrued expenses | 96,410 | 54,154
Intangible assets | 60,069 | 11,160
Tax credits | 50,356 | 50,356
Investment in unconsolidated ventures | 5,105 | 0
Capital loss carryforward | 2,263 | 40,723
Other | 8,561 | 8,098
Total gross deferred income tax asset | 872,625 | 1,058,559
Valuation allowance | (380,990) | (408,903)
Net deferred income tax assets | 491,635 | 649,656
Deferred income tax liabilities: |  |
Operating lease right-of-use assets | (277,489) | (328,100)
Property, plant and equipment | (223,703) | (303,853)
Investment in unconsolidated ventures | 0 | (33,100)
Total gross deferred income tax liability | (501,192) | (665,053)
Net deferred tax asset (liability) | $ (9,557) | $ (15,397)

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