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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$ 41,621	$ 29,389	$ 78,725	$ 50,428
Denominator for basic earnings per share – weighted average shares outstanding (in shares)	36,852	39,399	36,847	39,567
Effect of dilutive securities– Employee stock options and restricted stock awards (in shares)	843	1,291	917	1,400
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares)	37,695	40,690	37,764	40,967
Basic earnings per common share (in dollars per share)	$ 1.13	$ 75	$ 2.14	$ 1.27
Diluted earnings per common share and common share equivalents (in dollars per share)	$ 1.10	$ 72	$ 2.08	$ 1.23

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

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