Note 10 - Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income (loss) per common share -basic:
Income (loss) from continuing operations	$ (90,828)	$ 79,009	$ 52,622
Weighted average number of common shares outstanding (in shares)	82,722	82,999	85,095
Income from continuing operations: (in dollars per share)	$ (1.10)	$ 0.95	$ 0.62
Income (loss) per common share -diluted:
Income (loss) from continuing operations	$ (90,828)	$ 79,009	$ 52,622
Assumed conversions of Senior Notes		5,091	5,005
Adjusted income (loss) from continuing operations	$ (90,828)	$ 84,100	$ 57,627
Weighted average number of common shares outstanding (in shares)	82,722	82,999	85,095
Add: Dilutive effect of stock options and restricted stock awards (in shares)		1,733	1,767
Dilutive effect of Senior Notes (in shares)		15,682	15,682
Diluted weighted average number of common shares outstanding (in shares)	82,722	100,414	102,544
Income from continuing operations. (in dollars per share)	$ (1.10)	$ 0.84	$ 0.56
Stock options and restricted stock excluded from calculation of diluted earnings per share because anti-dilutive for the period (in shares)	3,884	788	415