Purchased Intangible Assets and Goodwill (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization	$ (1,069)	$ (1,069)	$ (1,100)
Definite life intangible assets, weighted average remaining life	5 years 4 months 17 days
Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Definite life intangible assets, amortization period	13 years
Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Definite life intangible assets, amortization period	20 years