Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2018

Payables and Accruals [Abstract]

Schedule of accrued expenses

Accrued expenses consisted of the following (in thousands):

	As of June 30, 2018		As of December 31, 2017
Compensation	$	11,270	$	19,897
Non-income taxes	8,155		6,895
Royalty tax withholdings	7,444		7,566
Other expenses	19,472		24,376
Total accrued expenses	$	46,341	$	58,734