Income Taxes (income Taxes) DTA Valuation Allowance Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes (DTA Valuation Allowance Rollforward) [Abstract]
Balance at the beginning of the period	$ 21,193	$ 22,687	$ 21,588
Net operating loss utilization	(2,397)	(3,505)	(884)
R&D tax credit (decrease) increase	172	272	383
Depreciation and amortization increase (decrease)	204	29	(309)
Reserves and accruals increase	1,558	1,273	1,581
Deferred tax assets decrease	300	437	328
Balance at the end of the period	$ 21,030	$ 21,193	$ 22,687