Note 2 - Earnings per Share (Detail) - Earnings per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic EPS:
Net income (in Dollars)	$ 14,463	$ 19,280	$ 30,097	$ 35,134
Assumed conversions of Senior Notes (in Dollars)	1,283	1,241	2,539	2,438
Adjusted net income (in Dollars)	$ 15,746	$ 20,521	$ 32,636	$ 37,572
Weighted average number of common shares outstanding-basic	88,600	89,791	89,536	89,707
Add: Dilutive effect of stock options and restricted stock awards	457	1,061	561	739
Dilutive effect of Senior Notes	15,682	15,682	15,682	15,682
Diluted weighted average number of common shares outstanding	104,739	106,534	105,779	106,128
Diluted income per common share (in Dollars per share)	$ 0.15	$ 0.19	$ 0.31	$ 0.35
Stock options and warrants excluded from calculation of diluted earnings per share because anti-dilutive for the period	2,440	2,536	2,123	3,731
Basic income per common share (in Dollars per share)	$ 0.16	$ 0.21	$ 0.34	$ 0.39