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Commitments and Contingencies - Contingent Consideration (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Contingent consideration        
Non-cash interest related to contingent liabilities   $ 476 $ 538  
Accrued incentives and earn-outs $ 8,790 8,790   $ 12,229
Income from write-off of contingent lease assets and liabilities   842    
Real Estate Investment | Accrued incentives and earn-out liabilities        
Contingent consideration        
Non-cash interest related to contingent liabilities 125 476    
Write-off of earn-out liability 3,476      
Write-off of lease incentive asset 2,634      
Income from write-off of contingent lease assets and liabilities 842      
Fair Value | Real Estate Investment | Accrued incentives and earn-out liabilities        
Contingent consideration        
Accrued incentives and earn-outs $ 8,790 $ 8,790