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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property and Equipment, net          
Property and equipment, gross $ 130,405   $ 130,405   $ 115,047
Less: Accumulated depreciation (62,025)   (62,025)   (48,106)
Total property and equipment, net 68,380   68,380   66,941
Property and equipment capitalized but not placed in service 5,700   5,700   4,300
Total depreciation and amortization expense     17,481 $ 17,711  
Property and Equipment          
Property and Equipment, net          
Total depreciation and amortization expense 4,800 $ 5,000 14,600 14,700  
Computer equipment, software, and internally developed software          
Property and Equipment, net          
Property and equipment, gross 79,316   79,316   65,973
Furniture and fixtures          
Property and Equipment, net          
Property and equipment, gross 4,679   4,679   3,705
Leasehold Improvements          
Property and Equipment, net          
Property and equipment, gross 7,108   7,108   6,067
Capitalized facility leases          
Property and Equipment, net          
Property and equipment, gross 39,302   39,302   39,302
Less: Accumulated depreciation (1,900)   (1,900)   (1,200)
Lease financing obligation 31,200   31,200   $ 30,900
Internally developed software          
Property and Equipment, net          
Amortization $ 3,400 $ 3,900 $ 10,800 $ 11,300