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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property and Equipment, net          
Property and equipment, gross $ 144,154   $ 144,154   $ 135,991
Less: Accumulated depreciation (73,198)   (73,198)   (65,281)
Total property and equipment, net 70,956   70,956   70,710
Property and equipment capitalized but not placed in service 3,100   3,100   7,800
Total depreciation and amortization expense     10,818 $ 11,747  
Property and Equipment          
Property and Equipment, net          
Total depreciation and amortization expense 4,700 $ 4,700 8,900 9,800  
Computer equipment, software, and internally developed software          
Property and Equipment, net          
Property and equipment, gross 91,013   91,013   83,568
Furniture and fixtures          
Property and Equipment, net          
Property and equipment, gross 5,274   5,274   4,779
Leasehold improvements          
Property and Equipment, net          
Property and equipment, gross 8,565   8,565   8,342
Capitalized facility leases          
Property and Equipment, net          
Property and equipment, gross 39,302   39,302   39,302
Less: Accumulated depreciation (2,700)   (2,700)   (2,200)
Lease financing obligation 31,500   31,500   $ 31,400
Internally developed software          
Property and Equipment, net          
Amortization $ 3,300 $ 3,400 $ 6,200 $ 7,400