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Summary of Significant Accounting Policies - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other Current Liabilities:    
Taxes other than income $ 57,850 $ 75,978
Accrued interest payable 36,590 42,998
Current portion of operating lease liability 29,036 0
Incentive compensation 18,573 46,937
Severance accrual 11,769 8,893
Legal reserve 3,000 53,500
Other accrued liabilities 63,746 26,381
Total other current liabilities $ 220,564 $ 254,687