Summary of Significant Accounting Policies (Inventories) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Obsolete Inventory Reserve
Balance at beginning of year	$ 3,314	$ 4,236	$ 2,880
Net additions charged to earnings	2,530	974	2,322
Disposals	(2,008)	(1,896)	(966)
Balance at end of year	$ 3,836	$ 3,314	$ 4,236