Summary of Significant Accounting Policies and Other Information - Schedule of Inventory, Current (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jan. 01, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Inventories
Raw materials	$ 90,877	$ 71,732
Work in process	2,390	4,535
Finished goods	18,077	16,684
Total inventories	111,344	92,951
Inventory allowance	(5,730)	(6,227)
Inventories, net	105,614	86,724	$ 112,392	$ 95,957	$ 91,689	$ 81,565	$ 113,074	$ 103,335	$ 97,286
Inventory Allowance
Balance at beginning of period	6,227	10,082
Charged to expense	2,153	421
Write-offs	(2,650)	(4,276)
Balance at end of year	$ 5,730	$ 6,227