Note 7 - Earnings Per Common Share (Details) - Basic and Diluted Earnings Per Common 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 and Diluted Earnings Per Common Share [Abstract]
Net income (in Dollars)	$ 16,176		$ 6,365		$ 30,818		$ 14,257
Net income applicable to non-vested restricted shares (in Dollars)	(219)		(76)		(431)		(215)
Net income applicable to common shares (in Dollars)	$ 15,957		$ 6,289		$ 30,387		$ 14,042
Weighted-average common shares outstanding (basic)	74,017		73,659		73,942		73,582
Dilutive effect of common stock equivalents	7		0		8		0
Weighted-average diluted common shares outstanding	74,024		73,659		73,950		73,582
Basic earnings per common share (in Dollars per share)	$ 0.22		$ 0.09		$ 0.41		$ 0.19
Diluted earnings per common share (in Dollars per share)	$ 0.22		$ 0.09		$ 0.41		$ 0.19
Anti-dilutive shares not included in the computation of diluted earnings per common share (1)	1,447	[1]	1,756	[1]	1,520	[1]	1,809	[1]

[1] This amount represents outstanding stock options for which the exercise price is greater than the average market price of the Company's common stock.