Inventories (Summary of Activity within the Reserve for Excess, Obsolete, and Slow Moving Inventory) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Inventory [Roll Forward]
Beginning balance	$ 5,575	$ 5,570	$ 4,907
Excess, obsolete and slow moving inventory expense	1,539	731	2,068
Scrapped inventory and other adjustments	314	(726)	(1,405)
Ending balance	$ 7,428	$ 5,575	$ 5,570