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v3.6.0.2

Income Taxes - Schedule of Deferred Tax Asset and Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred Tax Assets |  |
Net operating losses | $ 352,001 | $ 223,402
Alternative minimum tax credits | 218,773 | 228,693
Foreign tax credits | 3,816 | 3,837
Derivative instruments | 13,771 | 0
Incentive compensation | 22,852 | 22,509
Deferred compensation | 8,217 | 7,869
Post-retirement benefits | 13,865 | 13,556
Other | 2,743 | 2,905
Less: valuation allowance | (5,186) | (4,965)
Total | 630,852 | 497,806
Deferred Tax Liabilities |  |
Properties and equipment | 1,207,545 | 1,303,840
Equity method investments | 2,754 | 1,202
Total | 1,210,299 | 1,305,042
Net deferred tax liabilities | $ 579,447 | $ 807,236

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