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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Property and Equipment, net            
Property and equipment, gross $ 77,250   $ 77,250     $ 143,196
Less: Accumulated depreciation (46,301)   (46,301)     (81,685)
Total property and equipment, net 30,949   30,949   $ 36,050 61,511
Property and equipment capitalized but not placed in service 1,500   1,500     1,100
Total depreciation and amortization expense     19,357 $ 16,808    
Property and equipment disposals 52,100   52,100      
Property and Equipment            
Property and Equipment, net            
Total depreciation and amortization expense 4,600 $ 5,000 14,700 13,900    
Computer equipment, software, and internally developed software            
Property and Equipment, net            
Property and equipment, gross 56,649   56,649     99,204
Furniture and fixtures            
Property and Equipment, net            
Property and equipment, gross 4,762   4,762     4,758
Leasehold improvements            
Property and Equipment, net            
Property and equipment, gross 15,839   15,839     8,602
Capitalized facility leases            
Property and Equipment, net            
Property and equipment, gross 0   0     $ 30,632
Internally developed software            
Property and Equipment, net            
Amortization $ 3,400 $ 3,600 $ 10,700 $ 9,900