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Accrued Liabilities Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accrued salaries and other benefits $ 19,300 $ 24,252
Accrued income and other taxes 11,019 11,820
Accrued interest 16,462 11,999
Derivative liability - current 593 0
Other accrued liabilities 20,471 30,926
Accrued liabilities $ 67,845 $ 78,997