Summary of Significant Accounting Policies and Other Information - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Inventories
Raw materials	$ 95,567		$ 90,877
Work in process	4,361		2,390
Finished goods	23,682		18,077
Total inventories	123,610		111,344
Inventory allowance	(5,809)		(5,730)
Inventories, net	117,801		$ 105,614
Inventory Allowance
Balance at beginning of period	5,730	$ 6,227
Charged to expense	314	(370)
Write-offs	(235)	(179)
Balance at end of period	$ 5,809	$ 5,678