Description of Business and Summary of Significant Accounting Policies (Warranty) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Product Warranty
Product warranty period	2 years
Changes in the product warranty liability
Balance at beginning of period	$ 1,191	$ 1,213	$ 1,155
Warranty costs accrued	2,068	1,145	1,025
Warranty claims	(1,844)	(1,167)	(967)
Balance at end of period	$ 1,415	$ 1,191	$ 1,213