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Commitments and Contingencies - Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies      
Capital lease obligations $ 7,600 $ 7,600  
Amortization 4,900 3,800  
Capital lease obligations, current 1,085 1,200  
Capital lease obligations, noncurrent 2,114 3,200  
Rent expense for operating leases 4,400 3,600 $ 4,000
Commitments for future minimum lease payments on noncancelable leases      
2019 3,773    
2020 1,563    
2021 854    
2022 569    
2023 509    
Thereafter 642    
Total minimum lease payments 7,910    
Less: Amount representing minimum operating lease payments (3,938)    
Total minimum capital lease payments 3,972    
Less: Amount representing estimated taxes, maintenance and insurance costs included in total amounts above (652)    
Net minimum capital lease payments 3,320    
Less: Amount representing interest (121)    
Present value of net minimum lease payments 3,199    
Less: Current maturities of capital lease obligations (1,085) (1,200)  
Long-term capital lease obligations $ 2,114 $ 3,200