Restructuring and Other Exit Costs (Income) - Restructuring and Other Related Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0	$ (249)	$ 13,897
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	(19)	738
Marketing
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	(82)	2,950
Product development
Restructuring Cost and Reserve [Line Items]
Restructuring costs	0	(110)	3,232
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0	$ (38)	$ 6,977