Property and Equipment, net (Details) (USD $)	6 Months Ended			3 Months Ended		6 Months Ended								3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Property and equipment	Jun. 30, 2013 Property and equipment	Jun. 30, 2014 Property and equipment	Jun. 30, 2013 Property and equipment	Jun. 30, 2014 Computer equipment and internally developed software	Dec. 31, 2013 Computer equipment and internally developed software	Jun. 30, 2014 Furniture and Fixtures	Dec. 31, 2013 Furniture and Fixtures	Jun. 30, 2014 Leasehold Improvements	Dec. 31, 2013 Leasehold Improvements	Jun. 30, 2014 Internally developed software	Jun. 30, 2013 Internally developed software	Jun. 30, 2014 Internally developed software	Jun. 30, 2013 Internally developed software
Property and Equipment, net
Property and equipment, gross	$ 31,855,000		$ 27,092,000					$ 26,757,000	$ 22,517,000	$ 2,048,000	$ 1,654,000	$ 3,050,000	$ 2,921,000
Less: Accumulated depreciation	(14,751,000)		(11,854,000)
Total property and equipment, net	17,104,000		15,238,000
Depreciation and amortization expense	5,875,000	5,609,000		1,900,000	1,700,000	3,900,000	3,400,000
Amortization														$ 1,200,000	$ 1,000,000	$ 2,300,000	$ 2,000,000