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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Property and Equipment, net      
Property and equipment, gross $ 139,929   $ 135,991
Less: Accumulated depreciation (68,544)   (65,281)
Total property and equipment, net 71,385   70,710
Property and equipment capitalized but not placed in service 8,000   7,800
Total depreciation and amortization expense 5,169 $ 6,079  
Property and Equipment      
Property and Equipment, net      
Total depreciation and amortization expense 4,200 5,100  
Computer equipment, software, and internally developed software      
Property and Equipment, net      
Property and equipment, gross 86,874   83,568
Property and equipment capitalized but not placed in service 5,400    
Furniture and fixtures      
Property and Equipment, net      
Property and equipment, gross 5,204   4,779
Leasehold improvements      
Property and Equipment, net      
Property and equipment, gross 8,549   8,342
Capitalized facility leases      
Property and Equipment, net      
Property and equipment, gross 39,302   39,302
Less: Accumulated depreciation (2,400)   (2,200)
Lease financing obligation 31,400   $ 31,400
Leasehold improvements and furniture      
Property and Equipment, net      
Property and equipment capitalized but not placed in service 2,300    
Internally developed software      
Property and Equipment, net      
Amortization $ 2,900 $ 4,000