Goodwill and Intangible Assets (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 60,226	$ 59,115
Accumulated Amortization	15,686	11,045
Net Carrying Amount	44,540	48,070
Trademarks and patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,057	1,065
Accumulated Amortization	280	227
Net Carrying Amount	777	838
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	37,246	36,479
Accumulated Amortization	11,969	8,394
Net Carrying Amount	25,277	28,085
Covenant not-to-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,032	1,042
Accumulated Amortization	549	358
Net Carrying Amount	483	684
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,891	20,529
Accumulated Amortization	2,888	2,066
Net Carrying Amount	$ 18,003	$ 18,463