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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$ 29,389	$ 21,999	$ 50,428	$ 36,478
Denominator for basic earnings per share – weighted average shares outstanding (in shares)	39,399	39,641	39,567	39,493
Effect of dilutive securities– Employee stock options and restricted stock awards (in shares)	1,291	1,198	1,400	1,244
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions (in shares)	40,690	40,839	40,967	40,737
Basic earnings per common share (in dollars per share)	$ 0.75	$ 0.55	$ 1.27	$ 0.92
Diluted earnings per common share and common share equivalents (in dollars per share)	$ 0.72	$ 0.54	$ 1.23	$ 0.90

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

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