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Leases - Balance Sheet Classifications (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating leases, ROU assets $ 35,213  
Right of use assets 4,357  
Right of use assets [1] 39,570 $ 4,466
Operating leases, current ROU liabilities 11,503  
Current right of use liabilities 681  
Current right of use liabilities [1] 12,184  
Operating leases, noncurrent ROU liabilities 29,967  
Long-term right of use liabilities 6,290  
Long-term right of use liabilities $ 36,257  
[1] For comparative purposes, prior year finance lease assets have been reclassified from "Property and equipment, net" to "Right of use assets". Prior year finance lease liabilities have been reclassified as right of use liabilities.