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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Property and Equipment, net      
Property and equipment, gross $ 122,083   $ 115,047
Less: Accumulated depreciation (53,541)   (48,106)
Total property and equipment, net 68,542   66,941
Property and equipment capitalized but not placed in service 2,900   4,300
Total depreciation and amortization expense 6,079 $ 5,902  
Property and Equipment      
Property and Equipment, net      
Total depreciation and amortization expense 5,100 4,900  
Computer equipment, software, and internally developed software      
Property and Equipment, net      
Property and equipment, gross 70,546   65,973
Furniture and fixtures      
Property and Equipment, net      
Property and equipment, gross 4,807   3,705
Leasehold Improvements      
Property and Equipment, net      
Property and equipment, gross 7,428   6,067
Capitalized facility leases      
Property and Equipment, net      
Property and equipment, gross 39,302   39,302
Less: Accumulated depreciation (1,400)   (1,200)
Lease financing obligation 31,000   $ 30,900
Internally developed software      
Property and Equipment, net      
Amortization $ 4,000 $ 3,700