Note 2 - Earnings per Share (Details) - Earnings per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic EPS:
Net income (loss) (in Dollars)	$ 15,664	$ 14,463	$ 33,039	$ 30,097
Assumed conversions of Senior Notes (in Dollars)	1,279	1,283	2,544	2,539
Adjusted net income (in Dollars)	$ 16,943	$ 15,746	$ 35,583	$ 32,636
Weighted average number of common shares outstanding - basic	84,813	88,600	84,459	89,536
Add: Dilutive effect of stock options and restricted stock awards	1,810	457	1,727	561
Dilutive effect of Senior Notes	15,682	15,682	15,682	15,682
Diluted weighted average number of common shares outstanding	102,305	104,739	101,868	105,779
Diluted income per common share (in Dollars per share)	$ 0.17	$ 0.15	$ 0.35	$ 0.31
Stock options and restricted stock excluded from calculation of diluted earnings per share because anti-dilutive for the period	377	2,440	240	2,123
Basic income per common share (in Dollars per share)	$ 0.19	$ 0.16	$ 0.39	$ 0.34