Note 6 - Stockholders' Equity and Equity Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Stock Awards			Weighted Average Award Date Fair Value
Outstanding at January 1, 2013		701,918		$	19.42
Restricted shares awarded		395,927			24.18
Restricted stock and performance units awarded		112,401			25.11
Restricted shares distributed		(166,076	)		21.72
Restricted stock and performance units distributed		(10,661	)		20.45
Restricted shares forfeited		(4,693	)		18.11
Restricted stock and performance units forfeited		(3,222	)		18.11
Outstanding at March 31, 2013		1,025,594		$	21.51

Schedule of Other Share-based Compensation, Activity [Table Text Block]

	Deferred Stock Units			Weighted Average Award Date Fair Value
Outstanding at January 1, 2013		181,518		$	19.06
Awarded		–			–
Shares distributed		(3,171	)		21.78
Forfeited		–			–
Outstanding at March 31, 2013		178,347		$	19.01

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares			Weighted Average Exercise Price
Outstanding at January 1, 2013		1,223,618		$	18.49
Granted		29,025			25.11
Exercised		(29,511	)		20.14
Canceled		(3,150	)		19.41
Outstanding at March 31, 2013		1,219,982		$	18.61
Exercisable at March 31, 2013		939,209		$	17.92

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

	2013		2012
Amount collected from stock option exercises	$	738	$	207
Total intrinsic value of stock option exercises		143		52
Tax benefit of stock option exercises recorded in additional paid-in-capital		55		6
Aggregate intrinsic value of outstanding stock options		3,893		2,305
Aggregate intrinsic value of exercisable stock options		2,959		2,298

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	For the Quarter Ended March 31,
	2013						2012
	Range			Weighted Average			Range			Weighted Average
Weighted average grant-date fair value		n/a		$	12.92			n/a		$	8.19
Volatility		49.8	%		49.8	%		45.2	%		45.2	%
Expected term (years)		7.0			7.0			7.0			7.0
Dividend yield		0.0	%		0.0	%		0.0	%		0.0	%
Risk-free rate		1.1	%		1.1	%		1.5	%		1.5	%