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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Compensation $ 12,018 $ 15,153
Non-income taxes 9,376 7,885
Royalty tax withholdings 5,703 5,618
Other expenses 26,181 22,729
Total accrued expenses $ 53,278 $ 51,385