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Changes in Fair Value of Contingent Consideration Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Contingent Consideration Obligations [Roll Forward]      
Beginning balance $ 7,295 $ 55,653  
Contingent consideration liabilities recorded for business acquisitions 0 5,854 $ 3,854
Payments (2,815) (52,363)  
Loss (gain) included in earnings 454 (1,851)  
Exchange rate effects (350) 2  
Ending balance $ 4,584 $ 7,295 $ 55,653