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Income Taxes - Schedule of Composition of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets |  |
Net operating losses | $ 22,177 | $ 22,360
Alternative minimum tax credits | 0 | 22,120
Incentive compensation | 16,427 | 17,776
Deferred compensation | 5,753 | 5,463
Post-retirement benefits | 7,482 | 7,847
Equity method investments | 0 | 21,454
Leases | 7,709 | 8,192
Capital loss carryforward | 16,486 | 0
Other | 3,267 | 1,336
Less: valuation allowance | (28,231) | (31,763)
Total | 51,070 | 74,785
Deferred Tax Liabilities |  |
Properties and equipment | 809,919 | 768,692
Equity method investments | 1,649 | 0
Leases | 7,709 | 8,192
Derivative instruments | 5,988 | 5
Total | 825,265 | 776,889
Net deferred tax liabilities | $ 774,195 | $ 702,104

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