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Note 4 - Earnings Per Share - Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$ 39,104	$ 41,665	$ 117,829	$ 92,093
Denominator for basic earnings per share – weighted average shares outstanding (in shares)	36,545	39,309	36,744	39,480
Effect of dilutive securities – Employee and director stock options and restricted share awards (in shares)	806	1,079	881	1,155
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares)	37,351	40,388	37,625	40,635
Basic earnings per common share (in dollars per share)	$ 1.07	$ 1.06	$ 3.21	$ 2.33
Diluted earnings per common share and common share equivalents (in dollars per share)	$ 1.05	$ 1.03	$ 3.13	$ 2.27

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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