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Acquisitions (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquisitions          
Goodwill   $ 123,950 $ 124,479 $ 123,950 $ 123,881
Goodwill acquired     1,848 2,070  
Finite-lived Intangible Assets Acquired       1,062  
North America          
Acquisitions          
Goodwill   85,834 85,488 85,834 84,526
Goodwill acquired     0 1,860  
Europe          
Acquisitions          
Goodwill   36,720 37,616 36,720 $ 37,788
Goodwill acquired     $ 1,848 210  
EBTY | North America          
Acquisitions          
Cash paid for acquisition   3,400      
Goodwill   2,000   2,000  
Intangible assets   $ 1,100   $ 1,100  
Weighted-average amortization period   7 years      
MSD          
Acquisitions          
Weighted-average amortization period 7 years        
MSD | Europe          
Acquisitions          
Cash paid for acquisition $ 6,900        
Cash Acquired from Acquisition 1,500        
Other Current Assets 2,100        
Noncurrent Assets 5,000        
Current Liabilities 700        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other 1,000        
Goodwill acquired 1,900        
Finite-lived Intangible Assets Acquired $ 1,200