Note 12- Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income available to common shareholders	$ 40,582	$ 66,053	$ 79,957
Denominator for basic earnings per share – weighted average shares (in shares)	39,938	40,271	39,783
Employee and director stock options and restricted share awards (in shares)	665	822	1,111
Denominator for diluted earnings per share - adjusted weighted average shares and assumed conversions (in shares)	40,603	41,093	40,894
Basic earnings per common share (in dollars per share)	$ 1.02	$ 1.64	$ 2.01
Diluted earnings per common share and common share equivalents (in dollars per share)	$ 1	$ 1.61	$ 1.96