Intangible Assets - Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Intangible Assets
Total amortization	$ 1,837	$ 3,032
Service costs
Intangible Assets
Total amortization	1,303	1,700
Accelerated amortization of intangible assets	500
Sales and marketing
Intangible Assets
Total amortization	143	949
Product development
Intangible Assets
Total amortization	247	247
General and administrative
Intangible Assets
Total amortization	$ 144	136
Maximum | Service costs
Intangible Assets
Accelerated amortization of intangible assets		$ 100