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Commitments and Contingencies - Agreements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Future Lease Obligations      
2017 $ 6,903    
2018 6,065    
2019 5,952    
2020 5,987    
2021 6,126    
Thereafter 15,839    
Future minimum rental payments 46,872    
Rent expense 9,200 $ 7,100  
Letters of Credit      
Contingent liability for letters of credit     $ 130
Employment agreements      
2017 2,600    
2018 1,000    
2019 $ 400