Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Disclosure Accrued Liabilities [Abstract]
Accrued payroll and benefits	$ 102,109	$ 103,004
Accrued expenses	36,110	27,318
Accrued fixed assets	17,765	11,362
Accrued warranty	8,026	5,929
Accrued professional fees	7,774	6,316
Accrued sales rebate	7,765	11,209
Accrued customer credits	7,618	5,373
Accrued sales tax and value added tax	6,734	5,503
Accrued sales return reserve	5,876	1,364
Accrued income taxes	4,111	12,405
Other accrued liabilities	15,147	5,779
Total accrued liabilities	$ 219,035	$ 195,562