Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenues	$ 1,069,372	$ 889,163	$ 2,093,333	$ 1,758,954
Cost of revenues	753,525	643,428	1,480,388	1,267,361
Marketing	121,760	113,964	250,935	243,892
Technology and development	93,126	81,547	185,101	164,348
General and administrative	43,844	34,070	87,970	69,134
Operating income	57,117	16,154	88,939	14,219
Other income (expense):
Interest expense	(7,528)	(5,006)	(14,268)	(9,980)
Interest and other income (expense)	(2,940)	(493)	(1,963)	(609)
Loss on extinguishment of debt	0	0	(25,129)	0
Income before income taxes	46,649	10,655	47,579	3,630
Provision for income taxes	17,178	4,491	15,419	2,050
Net income	$ 29,471	$ 6,164	$ 32,160	$ 1,580
Earnings per share:
Basic (in dollars per share)	$ 0.51	$ 0.11	$ 0.56	$ 0.03
Diluted (in dollars per share)	$ 0.49	$ 0.11	$ 0.53	$ 0.03
Weighted average common shares outstanding:
Basic (in shares)	58,192	55,526	57,089	55,491
Diluted (in shares)	60,590	58,809	60,369	58,878