Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Intangible Assets
Gross Carrying Value	$ 42,290	$ 41,995
Accumulated amortization	(13,306)	(10,161)
Net Carrying Value	28,984	31,834
Acquired technology and domain name
Intangible Assets
Gross Carrying Value	31,090	30,725
Accumulated amortization	(10,024)	(7,624)
Net Carrying Value	21,066	23,101
Customer relationships
Intangible Assets
Gross Carrying Value	6,300	6,300
Accumulated amortization	(2,302)	(1,732)
Net Carrying Value	3,998	4,568
Trade names
Intangible Assets
Gross Carrying Value	4,900	4,970
Accumulated amortization	(980)	(805)
Net Carrying Value	$ 3,920	$ 4,165