Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Deferred Costs
Internal sales commissions	$ 15,598		$ 15,598		$ 13,171
Third party commissions	12,594		12,594		13,665
External legal counsel	567		567		393
Total	28,759		28,759		27,229
Recoverability of Long-Lived Assets
Impairment of real estate	0	$ 0	0	$ 0
Impairment loss related to intangible assets	0	0	0	0
Goodwill	41,191		41,191		$ 41,191
Impairment loss related to goodwill	$ 0	$ 0	$ 0	$ 0