Goodwill and Intangible Assets (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 61,197	$ 61,236
Accumulated Amortization	18,975	17,506
Net Carrying Amount	42,222	43,730
Trademarks and patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,064	1,075
Accumulated Amortization	317	303
Net Carrying Amount	747	772
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	37,852	37,825
Accumulated Amortization	14,406	13,340
Net Carrying Amount	23,446	24,485
Covenant not-to-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,041	1,056
Accumulated Amortization	675	628
Net Carrying Amount	366	428
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,240	21,280
Accumulated Amortization	3,577	3,235
Net Carrying Amount	$ 17,663	$ 18,045