Intangible Assets - Intangible Assets by Major Class (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended	12 Months Ended								12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jan. 31, 2011 Domain and trade names [Member]	Jun. 30, 2011 Domain and trade names [Member]	Dec. 31, 2011 Domain and trade names [Member]	Jun. 30, 2012 Domain and trade names [Member]	Jun. 30, 2012 Customer relationships [Member]	Dec. 31, 2011 Customer relationships [Member]	Jun. 30, 2012 Technology [Member]	Dec. 31, 2011 Technology [Member]	Jun. 30, 2012 Non-compete agreements [Member]	Dec. 31, 2011 Non-compete agreements [Member]	Dec. 31, 2011 Level 3 [Member] Discounted cash flows [Member] Domain and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 49,091		$ 49,091						$ 33,345	$ 10,651	$ 10,878	$ 4,141	$ 4,160	$ 954	$ 982
Gross Carrying Amount					49,525			33,505
Accumulated Amortization	(34,528)		(34,528)		(16,861)			(11,255)	(26,628)	(4,569)	(3,826)	(2,672)	(1,287)	(659)	(493)
Impairment	0	0	0	(14,980)		(14,980)	(14,980)	(14,980)
Intangible assets, net	14,563		14,563		17,684			7,270	6,717	6,082	7,052	1,469	2,873	295	489
Amortization expense	$ 1,400	$ 1,900	$ 2,815	$ 3,535
Discount rate																17.00%