Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Other Intangible Assets (Details)

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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, Carrying Amount $ 143,618 $ 136,487
Finite-lived intangible assets, Accumulated Amortization (78,297) (68,164)
Finite-lived intangible assets, Net 65,321 68,323
Total intangible assets, Carrying Amount 184,679 176,979
Total intangible assets, Net 106,382 108,815
Developed technologies
   
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, Amortization Period 3 years 3 years
Finite-lived intangible assets, Carrying Amount 52,335 45,014
Finite-lived intangible assets, Accumulated Amortization (34,441) (29,952)
Finite-lived intangible assets, Net 17,894 15,062
Customer relationships
   
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, Carrying Amount 85,633 85,823
Finite-lived intangible assets, Accumulated Amortization (38,855) (33,503)
Finite-lived intangible assets, Net 46,778 52,320
Customer relationships | Minimum
   
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, Amortization Period 1 year 1 year
Customer relationships | Maximum
   
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, Amortization Period 10 years 10 years
Vendor relationships
   
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, Amortization Period 7 years 7 years
Finite-lived intangible assets, Carrying Amount 5,650 5,650
Finite-lived intangible assets, Accumulated Amortization (5,001) (4,709)
Finite-lived intangible assets, Net 649 941
Tradenames
   
Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets, Accumulated Amortization $ 41,061 $ 40,492