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Income Taxes - Schedule of Deferred Tax Asset and Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Assets |  |
Net operating losses | $ 56,769 | $ 207,633
Alternative minimum tax credits | 114,149 | 208,624
Foreign tax credits | 3,473 | 3,541
Other business credits | 3,380 | 3,524
Derivative instruments | 0 | 6,645
Incentive compensation | 17,378 | 15,898
Deferred compensation | 5,690 | 6,065
Post-retirement benefits | 6,799 | 7,265
Equity method investments | 20,746 | 21,812
Capital loss carryforward | 8,877 | 0
Other | 2,957 | 492
Less: valuation allowance | (14,943) | (16,711)
Total | 225,275 | 464,788
Deferred Tax Liabilities |  |
Properties and equipment | 670,704 | 691,818
Derivative instruments | 13,168 | 0
Total | 683,872 | 691,818
Net deferred tax liabilities | $ 458,597 | $ 227,030

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