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Commitments and Contingencies - Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
Rent expense $ 2,100 $ 2,000 $ 2,600
Capital Leases      
2017 7,670    
2018 4,233    
2019 2,234    
2020 186    
2021 0    
Total future minimum lease payment 14,323    
Less — amount representing interest (2,178)    
Present value of total capital lease obligation 12,145    
Capital lease obligation — current portion 6,230 4,972  
Capital lease obligation — net of current portion 5,915 $ 4,606  
Operating Leases      
2017 2,144    
2018 359    
2019 19    
2020 0    
2021 0    
Total future minimum lease payment $ 2,522