Note 2 - Net Income per Share (Detail) - Net Income Per Basic and Diluted Share (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income (in Dollars)	$ 40,184	$ 44,545
Add back interest expense for convertible notes, net of estimated tax of $15,000 and $686,000 for the three months ended March 31, 2012 and 2011, respectively (see Note 9) (in Dollars)	27	1,275
Income used to compute net income per diluted share (in Dollars)	$ 40,211	$ 45,820
Total weighted-average shares used to compute net income per basic share	139,680	139,640
Weighted-average shares used to compute net income per diluted share	140,204	189,954
Restricted Stock [Member]
Restricted stock outstanding	68	27
Effect of dilutive stock options	68	27
Stock Options [Member]
Restricted stock outstanding	15
Effect of dilutive stock options	15
Series 2012 Notes [Member]
Assumed conversion of debt	315
Due 2012 [Member]
Assumed conversion of debt		19,282
Due February 2015 [Member]
Assumed conversion of debt	126	26,005
Weighted-average shares used to compute net income per diluted share	140,204	184,954