Intangible Assets - Amortization Expense by Classification (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 3,114	$ 7,225	$ 6,146	$ 11,936
Service Costs
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	1,786	5,879	3,486	8,714
Sales and Marketing
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	948	949	1,897	1,965
Product Development
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	246	246	493	947
General and Administrative
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 134	$ 151	$ 270	$ 310