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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property and Equipment, net          
Property and equipment, gross $ 147,389   $ 147,389   $ 135,991
Less: Accumulated depreciation (78,215)   (78,215)   (65,281)
Total property and equipment, net 69,174   69,174   70,710
Property and equipment capitalized but not placed in service 3,000   3,000   7,800
Total depreciation and amortization expense     16,808 $ 17,481  
Property and Equipment          
Property and Equipment, net          
Total depreciation and amortization expense 5,000 $ 4,800 13,900 14,600  
Computer equipment, software, and internally developed software          
Property and Equipment, net          
Property and equipment, gross 95,182   95,182   83,568
Furniture and fixtures          
Property and Equipment, net          
Property and equipment, gross 5,284   5,284   4,779
Leasehold improvements          
Property and Equipment, net          
Property and equipment, gross 8,572   8,572   8,342
Capitalized facility leases          
Property and Equipment, net          
Property and equipment, gross 38,351   38,351   39,302
Less: Accumulated depreciation (2,900)   (2,900)   (2,200)
Lease financing obligation 31,500   31,500   $ 31,400
Internally developed software          
Property and Equipment, net          
Amortization $ 3,600 $ 3,400 $ 9,900 $ 10,800