Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenues	$ 1,270,089	$ 1,023,961
Cost of revenues	869,186	736,952
Marketing	137,098	119,086
Technology and development	110,310	91,975
General and administrative	55,900	44,126
Operating income	97,595	31,822
Other income (expense):
Interest expense	(10,052)	(6,740)
Interest and other income (expense)	1,401	977
Loss on extinguishment of debt	0	(25,129)
Income before income taxes	88,944	930
Provision (benefit) for income taxes	35,829	(1,759)
Net income	$ 53,115	$ 2,689
Earnings per share:
Basic (in dollars per share)	$ 0.89	$ 0.05
Diluted (in dollars per share)	$ 0.86	$ 0.05
Weighted-average common shares outstanding:
Basic (in shares)	59,817	55,972
Diluted (in shares)	61,548	60,146