Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Revenues	$ 889,163	$ 788,610	$ 1,758,954	$ 1,507,163
Cost of revenues:
Subscription	583,636	428,203	1,147,651	805,195
Fulfillment expenses	59,792	61,775	119,710	122,934
Total cost of revenues	643,428	489,978	1,267,361	928,129
Gross profit	245,735	298,632	491,593	579,034
Operating expenses:
Marketing	118,224	94,983	254,124	199,242
Technology and development	81,547	57,865	164,348	108,770
General and administrative	29,810	30,670	58,902	53,668
Total operating expenses	229,581	183,518	477,374	361,680
Operating income	16,154	115,114	14,219	217,354
Other income (expense):
Interest expense	(5,006)	(5,303)	(9,980)	(10,168)
Interest and other income (expense)	(493)	1,013	(609)	1,878
Income before income taxes	10,655	110,824	3,630	209,064
Provision for income taxes	4,491	42,610	2,050	80,617
Net income	$ 6,164	$ 68,214	$ 1,580	$ 128,447
Earnings per share:
Basic	$ 0.11	$ 1.30	$ 0.03	$ 2.44
Diluted	$ 0.11	$ 1.26	$ 0.03	$ 2.37
Weighted average common shares outstanding:
Basic	55,526	52,470	55,491	52,614
Diluted	58,809	53,909	58,878	54,077