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Leases - Minimum Lease Payments and Rent Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Leases    
Rent Expense $ 1,000 $ 800
Lease incentives 11,800  
Minimum lease payments    
2017 (nine months remaining) 1,746  
2018 4,132  
2019 3,675  
2020 3,729  
2021 and beyond 26,400  
Total minimum lease payments $ 39,682