Note 3 - Earnings Per Share (Details) - Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic EPS:
Net income from continuing operations (in Dollars)	$ 23,492	$ 15,431	$ 55,563	$ 42,157
Assumed conversions of Senior Notes (in Dollars)	1,294	1,370	3,808	3,875
Adjusted income from continuing operations (in Dollars)	$ 24,786	$ 16,801	$ 59,371	$ 46,032
Weighted average number of common shares outstanding - basic	82,055	85,775	83,260	84,902
Add: Dilutive effect of stock options and restricted stock awards	1,550	1,503	1,715	1,718
Dilutive effect of Senior Notes	15,682	15,682	15,682	15,682
Diluted weighted average number of common shares outstanding	99,287	102,960	100,657	102,302
Diluted income from continuing operations per common share (in Dollars per share)	$ 0.25	$ 0.16	$ 0.59	$ 0.45
Stock options and restricted stock excluded from calculation of diluted earnings per share because anti-dilutive for the period	1,075	591	821	565
Basic income from continuing operations per common share (in Dollars per share)	$ 0.29	$ 0.18	$ 0.67	$ 0.50