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Commitments and Contingencies - Contingent Consideration (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Contingent consideration      
Non-cash interest related to earn-out liabilities $ 409 $ 18 $ 256
Accrued incentives and earn-outs 12,722 3,258  
Earn-out liabilities      
Contingent consideration      
Non-cash interest related to earn-out liabilities 409 18  
Level 3 | Fair Value      
Contingent consideration      
Accrued incentives and earn-outs 12,722 $ 3,258  
Level 3 | Fair Value | Earn-out liabilities      
Contingent consideration      
Accrued incentives and earn-outs $ 12,722