Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Disclosure Accrued Liabilities [Abstract]
Accrued payroll and benefits	$ 69,581	$ 103,004
Accrued expenses	32,458	27,318
Accrued income taxes	17,134	12,405
Accrued fixed assets	15,241	11,362
Accrued warranty	6,657	5,929
Accrued professional fees	6,562	6,316
Accrued sales tax and value added tax	5,340	5,503
Accrued sales rebate	5,121	11,209
Accrued sales return reserve	4,887	1,364
Other accrued liabilities	17,112	11,152
Total accrued liabilities	$ 180,093	$ 195,562