Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Disclosure Accrued Liabilities [Abstract]
Accrued payroll and benefits	$ 87,697	$ 103,004
Accrued expenses	36,776	27,318
Accrued fixed assets	12,889	11,362
Accrued customer credits	11,552	5,373
Accrued income taxes	7,764	12,405
Accrued warranty	7,286	5,929
Accrued professional fees	6,876	6,316
Accrued sales tax and value added tax	5,955	5,503
Accrued sales return reserve	5,554	1,364
Accrued sales rebate	3,772	11,209
Other accrued liabilities	10,633	5,779
Total accrued liabilities	$ 196,754	$ 195,562