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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property and Equipment, net          
Property and equipment, gross $ 125,663   $ 125,663   $ 115,047
Less: Accumulated depreciation (57,266)   (57,266)   (48,106)
Total property and equipment, net 68,397   68,397   66,941
Property and equipment capitalized but not placed in service 4,500   4,500   4,300
Total depreciation and amortization expense     11,747 $ 11,677  
Property and Equipment          
Property and Equipment, net          
Total depreciation and amortization expense 4,700 $ 4,800 9,800 9,700  
Computer equipment, software, and internally developed software          
Property and Equipment, net          
Property and equipment, gross 74,853   74,853   65,973
Furniture and fixtures          
Property and Equipment, net          
Property and equipment, gross 4,654   4,654   3,705
Leasehold Improvements          
Property and Equipment, net          
Property and equipment, gross 6,854   6,854   6,067
Capitalized facility leases          
Property and Equipment, net          
Property and equipment, gross 39,302   39,302   39,302
Less: Accumulated depreciation (1,700)   (1,700)   (1,200)
Lease financing obligation 31,100   31,100   $ 30,900
Internally developed software          
Property and Equipment, net          
Amortization $ 3,400 $ 3,700 $ 7,400 $ 7,400