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v3.8.0.1

Income Taxes - Schedule of Deferred Tax Asset and Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets |  |
Net operating losses | $ 207,633 | $ 352,001
Alternative minimum tax credits | 208,624 | 218,773
Foreign tax credits | 3,541 | 3,816
Other business credits | 3,524 | 0
Derivative instruments | 6,645 | 13,771
Incentive compensation | 15,898 | 22,852
Deferred compensation | 6,065 | 8,217
Post-retirement benefits | 7,265 | 13,865
Equity method investments | 21,812 | 0
Other | 492 | 2,743
Less: valuation allowance | (16,711) | (5,186)
Total | 464,788 | 630,852
Deferred Tax Liabilities |  |
Properties and equipment | 691,818 | 1,207,545
Equity method investments | 0 | 2,754
Total | 691,818 | 1,210,299
Net deferred tax liabilities | $ 227,030 | $ 579,447

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