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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued Liabilities, Current [Abstract]    
Accrued compensation $ 12,034 $ 11,050
NET Services accrued contract payments 10,439 9,756
Accrued cash settled stock-based compensation 4,717 3,719
Income taxes payable 478 0
Other accrued expenses 10,756 14,666
Total accrued expenses $ 38,424 $ 39,191