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Goodwill and Other Intangible Assets - Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Customer Relationships [Member]
Dec. 31, 2013
Customer Relationships [Member]
Sep. 30, 2014
Customer Relationships [Member]
Minimum [Member]
Sep. 30, 2014
Customer Relationships [Member]
Maximum [Member]
Sep. 30, 2014
Acquired technology [Member]
Dec. 31, 2013
Acquired technology [Member]
Sep. 30, 2014
Acquired technology [Member]
Minimum [Member]
Sep. 30, 2014
Acquired technology [Member]
Maximum [Member]
Sep. 30, 2014
Patents [Member]
Dec. 31, 2013
Patents [Member]
Sep. 30, 2014
Trade Names [Member]
Dec. 31, 2013
Trade Names [Member]
Sep. 30, 2014
Trade Names [Member]
Minimum [Member]
Sep. 30, 2014
Trade Names [Member]
Maximum [Member]
Dec. 31, 2013
Noncompete Agreements [Member]
Sep. 30, 2014
Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]                                    
Finite-Lived Intangible Assets, Gross $ 96,553 $ 90,753 $ 60,062 $ 54,730     $ 27,580 $ 27,580     $ 1,658 $ 1,493 $ 7,193 $ 6,890     $ 60 $ 60
Finite-Lived Intangible Assets, Accumulated Amortization 12,478 9,151 6,919 5,236     3,700 2,598     338 254 1,461 1,003     60 60
Finite-Lived Intangible Assets, Net $ 84,075 $ 81,602 $ 53,143 $ 49,494     $ 23,880 $ 24,982     $ 1,320 $ 1,239 $ 5,732 $ 5,887     $ 0 $ 0
Finite-Lived Intangible Asset, Useful Life         5 years 30 years     3 years 20 years 20 years       3 years 12 years 3 years