Stock-based Compensation Plans and Awards - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation included in net loss	$ 7,562	$ 21,815	$ 27,384
Income tax benefit related to stock-based compensation included in net income (loss)		(706)	(782)
Total stock-based compensation included in net loss, net of tax	7,562	21,109	26,602
Income tax benefit from stock option exercises and restricted stock units	0
Service Costs
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation included in net loss	1,084	1,422	2,420
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation included in net loss	588	683	3,823
Product Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation included in net loss	1,836	4,745	3,835
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation included in net loss	$ 4,054	12,016	12,525
Discontinued Operations
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation included in net loss		$ 2,949	$ 4,781