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Business Combinations 2011 Acquisitions (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Aug. 01, 2011
GOFA [Member]
USD ($)
Aug. 01, 2011
GOFA [Member]
EUR (€)
Dec. 31, 2011
Clever Fellows Innovation Consortium [Member]
USD ($)
Apr. 02, 2011
Clever Fellows Innovation Consortium [Member]
USD ($)
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net         € 26,261    
Business Acquisition, Working Capital Adjustment         947    
Business Acquisition, Fair Value Of Net Assets Acquired Excluding Goodwill       28,372     732
Goodwill 398,905 398,941 288,770 11,438     2,938
Business Acquisition Cost of Acquired Entity Potential Purchase Price             5,000
Payments to Acquire Businesses, Gross           $ 2,000