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Commitments and Contingencies - Contingent Consideration (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Contingent consideration      
Non-cash interest related to contingent liabilities $ 538 $ 205  
Accrued incentives and earn-outs 12,514   $ 12,722
Real Estate Investment | Accrued incentives and earn-out liabilities      
Contingent consideration      
Non-cash interest related to contingent liabilities 538    
Fair Value | Real Estate Investment | Accrued incentives and earn-out liabilities      
Contingent consideration      
Accrued incentives and earn-outs $ 12,514