Purchased Intangible Assets and Goodwill (Composition of Purchased Intangibles) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Abstract]
Indefinite life intangible assets	$ 12,316	$ 12,274
Definite life intangible assets, net of accumulated amortization of $14,054 and $12,942	7,906	8,926
Total	20,222	21,200	23,134
Definite life intangible assets, accumulated amortization	$ 14,054	$ 12,942