Note 2 - Earnings per Share (Detail) - Earnings per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Basic EPS:
Net income-basic (in Dollars)	$ 18,742	$ 22,997	$ 48,839	$ 58,131
Assumed conversions of Senior Notes (in Dollars)	1,396	1,236	3,944	3,674
Adjusted net income (in Dollars)	$ 20,138	$ 24,233	$ 52,783	$ 61,805
Weighted average number of common shares outstanding-basic	86,423	90,212	88,491	89,877
Add: Dilutive effect of stock options and restricted stock awards	695	1,025	756	883
Dilutive effect of Senior Notes	15,682	15,682	15,682	15,682
Diluted weighted average number of common shares outstanding	102,800	106,919	104,929	106,442
Diluted income per common share (in Dollars per share)	$ 0.20	$ 0.23	$ 0.50	$ 0.58
Stock options and warrants excluded from calculation of diluted earnings per share because anti-dilutive for the period	3,377	2,862	2,503	3,913
Basic income per common share (in Dollars per share)	$ 0.22	$ 0.25	$ 0.55	$ 0.65