Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment (Details)

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Property and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Property and equipment, cost:      
Property and equipment, gross $ 83,389   $ 78,485
Less accumulated depreciation and amortization (49,849)   (45,485)
Property and equipment, net 33,540   33,000
Depreciation and amortization expense $ 4,091 $ 3,359  
Computer equipment and software      
Property and equipment, cost:      
Estimated Useful Life 3 years    
Property and equipment, gross $ 56,293   52,921
Office furniture and fixtures      
Property and equipment, cost:      
Property and equipment, gross $ 7,365   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    
Leasehold improvements      
Property and equipment, cost:      
Property and equipment, gross $ 18,177   17,286
Other office equipment      
Property and equipment, cost:      
Property and equipment, gross $ 1,554   $ 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