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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property and equipment, cost:          
Property and equipment, gross $ 88,440   $ 88,440   $ 78,485
Less accumulated depreciation and amortization (53,653)   (53,653)   (45,485)
Property and equipment, net 34,787   34,787   33,000
Depreciation and amortization expense 3,853 $ 4,048 $ 7,944 $ 7,407  
Computer equipment and software          
Property and equipment, cost:          
Estimated Useful Life     3 years    
Property and equipment, gross 58,442   $ 58,442   52,921
Leasehold improvements          
Property and equipment, cost:          
Property and equipment, gross 20,524   20,524   17,286
Office furniture and fixtures          
Property and equipment, cost:          
Property and equipment, gross 7,710   $ 7,710   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 $ 1,764   $ 1,764   $ 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