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Summary of Significant Accounting Policies - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other Current Liabilities:    
Incentive compensation $ 100,762 $ 73,014
Taxes other than income 56,874 44,925
Accrued interest payable 39,593 36,330
All other accrued liabilities 39,490 27,566
Total other current liabilities $ 236,719 $ 181,835