Purchased Intangible Assets and Goodwill (Composition of Purchased Intangibles) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Indefinite life intangible assets	$ 11,888	$ 11,949
Definite life intangible assets, net of accumulated amortization of $17,706 and $16,758	3,337	4,415
Total	15,225	16,364	$ 17,771
Definite life intangible assets, accumulated amortization	$ 17,706	$ 16,758