Stock Based Compensation Expense (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended		0 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Aug. 01, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Aug. 25, 2014 Restricted stock units	Jun. 30, 2014 Service costs	Jun. 30, 2013 Service costs	Jun. 30, 2014 Service costs	Jun. 30, 2013 Service costs	Jun. 30, 2014 Sales and marketing	Jun. 30, 2013 Sales and marketing	Jun. 30, 2014 Sales and marketing	Jun. 30, 2013 Sales and marketing	Jun. 30, 2014 Product development	Jun. 30, 2013 Product development	Jun. 30, 2014 Product development	Jun. 30, 2013 Product development	Jun. 30, 2014 General and administrative	Jun. 30, 2013 General and administrative	Jun. 30, 2014 General and administrative	Jun. 30, 2013 General and administrative
Stock-based Compensation Expense
Allocated Share-based Compensation Expense		$ 1,287	$ 2,437	$ 3,271	$ 4,767		$ 91	$ 118	$ 183	$ 224	$ 173	$ 476	$ 843	$ 832	$ 314	$ 245	$ 579	$ 480	$ 709	$ 1,598	$ 1,666	$ 3,231
Options converted in spin	1.2
Restricted stock units granted						0.4