Intangible Assets and Goodwill (Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Amortization expense
Amortization of purchased intangibles	$ 223	$ 226
Amortization expense	(516)	(548)
Cost of revenues
Amortization expense
Amortization of purchased intangibles	293	322
Operating expenses
Amortization expense
Amortization of purchased intangibles	$ 223	$ 226