Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Deferred Costs
Internal sales commissions	$ 16,855		$ 16,855		$ 13,171
Third party commissions	15,767		15,767		13,665
External legal counsel	583		583		393
Total	33,205		33,205		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