Goodwill and Other Intangible Assets Finite life intangibles Gross and Net at balance sheet dates (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 90,477	$ 90,623
Finite-Lived Intangible Assets, Accumulated Amortization	4,927	8,093
Finite-Lived Intangible Assets, Net	85,550	82,530
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	54,730	54,730
Finite-Lived Intangible Assets, Accumulated Amortization	3,081	4,698
Finite-Lived Intangible Assets, Net	51,649	50,032
acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	27,580	27,580
Finite-Lived Intangible Assets, Accumulated Amortization	1,128	2,230
Finite-Lived Intangible Assets, Net	26,452	25,350
Patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,217	1,363
Finite-Lived Intangible Assets, Accumulated Amortization	259	244
Finite-Lived Intangible Assets, Net	958	1,119
Finite-Lived Intangible Asset, Useful Life	20 years
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	6,890	6,890
Finite-Lived Intangible Assets, Accumulated Amortization	414	861
Finite-Lived Intangible Assets, Net	6,476	6,029
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	60	60
Finite-Lived Intangible Assets, Accumulated Amortization	45	60
Finite-Lived Intangible Assets, Net	$ 15	$ 0
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum [Member] \| Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Minimum [Member] \| acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum [Member] \| Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member] \| Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	30 years
Maximum [Member] \| acquired technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum [Member] \| Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years