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Commitments and Contingencies - Operating Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Future Minimum Rental Commitments      
Operating leases, rent expense $ 1,879 $ 2,660 $ 1,190
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2015 2,401    
2016 2,330    
2017 2,135    
2018 2,075    
2019 1,980    
Thereafter 10,260    
Operating leases, future minimum payments due 21,181    
Third Parties      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2015 1,256    
2016 1,219    
2017 1,164    
2018 1,104    
2019 1,009    
Thereafter 5,731    
Operating leases, future minimum payments due 11,483    
Related Partnership      
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2015 1,145    
2016 1,111    
2017 971    
2018 971    
2019 971    
Thereafter 4,529    
Operating leases, future minimum payments due $ 9,698    
Ownership percentage in partnership 50.00%