Organization And Summary Of Significant Accounting Policies (Computation Of Net Income Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income	$ 7,897	$ 7,675	$ 6,164	$ (4,584)	$ 35,219	[1]	$ 62,460	[1]	$ 68,214	[1]	$ 60,233	[1]	$ 17,152	$ 226,126	$ 160,853
Weighted-average common shares outstanding (in shares)													55,521	52,847	52,529
Basic earnings per share (in dollars per share)	$ 0.14	$ 0.14	$ 0.11	$ (0.08)	$ 0.66		$ 1.19		$ 1.30		$ 1.14		$ 0.31	$ 4.28	$ 3.06
Convertible Notes interest expense, net of tax													195	17	0
Numerator for diluted earnings per share													$ 17,347	$ 226,143	$ 160,853
Convertible notes shares													2,331	217	0
Employee stock options and employee stock purchase plan shares													1,052	1,305	1,775
Weighted-average number of shares (in shares)													58,904	54,369	54,304
Diluted earnings per share (in dollars per share)	$ 0.13	$ 0.13	$ 0.11	$ (0.08)	$ 0.64		$ 1.16		$ 1.26		$ 1.11		$ 0.29	$ 4.16	$ 2.96

[1] Net income for the three months ended December 31, 2011 includes $9.0 million of expense related to a legal settlement and $9.5 million of expense related to termination benefits associated with the Company’s retraction of plans to separate and rebrand the DVD-by-mail service.