Summary of Significant Accounting Policies - Schedule of Changes to Obsolete Inventories Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Obsolete Inventory Reserve
Balance at beginning of year	$ 3,836	$ 3,314	$ 4,236
Net additions charged to earnings	1,017	2,530	974
Disposals	(1,214)	(2,008)	(1,896)
Balance at end of year	$ 3,639	$ 3,836	$ 3,314