Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net (Details)

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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, cost:          
Property and equipment, gross $ 92,584   $ 92,584   $ 78,485
Less accumulated depreciation and amortization (57,310)   (57,310)   (45,485)
Property and equipment, net 35,274   35,274   33,000
Depreciation and amortization expense 3,724 $ 3,740 $ 11,668 $ 11,147  
Computer equipment and software          
Property and equipment, cost:          
Estimated Useful Life     3 years    
Property and equipment, gross 60,073   $ 60,073   52,921
Leasehold improvements          
Property and equipment, cost:          
Property and equipment, gross 22,580   22,580   17,286
Office furniture and fixtures          
Property and equipment, cost:          
Property and equipment, gross 8,048   $ 8,048   6,911
Office furniture and fixtures | Minimum          
Property and equipment, cost:          
Estimated Useful Life     3 years    
Office furniture and fixtures | Maximum          
Property and equipment, cost:          
Estimated Useful Life     7 years    
Other office equipment          
Property and equipment, cost:          
Property and equipment, gross $ 1,883   $ 1,883   $ 1,367
Other office equipment | Minimum          
Property and equipment, cost:          
Estimated Useful Life     3 years    
Other office equipment | Maximum          
Property and equipment, cost:          
Estimated Useful Life     5 years