Note 10 - Earnings per Share (Detail) - Earnings per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Basic EPS:
Net income (loss) (in Dollars)	$ 60,032	$ 80,017	$ 41,626
Assumed conversions of Senior Notes (in Dollars)	4,868	4,969	1,138
Adjusted net income (in Dollars)	$ 64,900	$ 84,986	$ 42,764
Weighted average number of common shares outstanding-basic	87,522	90,022	89,103
Add: Dilutive effect of stock options and restricted stock awards	876	965	790
Dilutive effect of Senior Notes	15,682	15,682	3,824
Diluted weighted average number of common shares outstanding	104,080	106,669	93,717
Diluted income per common share (in Dollars per share)	$ 0.62	$ 0.80	$ 0.46
Stock options and warrants excluded from calculation of diluted earnings per share because anti-dilutive for the period	2,671	2,907	3,913
Weighted average number of common shares outstanding	87,522	90,022	89,103
Basic income per common share (in Dollars per share)	$ 0.69	$ 0.89	$ 0.47