Goodwill and Intangible Assets (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 61,140	$ 61,236
Accumulated Amortization	20,647	17,506
Net Carrying Amount	40,493	43,730
Trademarks and patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,104	1,075
Accumulated Amortization	349	303
Net Carrying Amount	755	772
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	37,622	37,825
Accumulated Amortization	15,454	13,340
Net Carrying Amount	22,168	24,485
Covenant not-to-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,096	1,056
Accumulated Amortization	770	628
Net Carrying Amount	326	428
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,318	21,280
Accumulated Amortization	4,074	3,235
Net Carrying Amount	$ 17,244	$ 18,045