Note 7 - Equity-based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Shareholders' Equity and Share-based Payments [Abstract]

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

A summary of stock award activity during the years ended December 31, 2013, 2012 and 2011 is as follows:

	For the Years Ended December 31,
	2013				2012				2011
	Stock Awards		Weighted Average Award Date Fair Value		Stock Awards		Weighted Average Award Date Fair Value		Stock Awards		Weighted Average Award Date Fair Value
Outstanding, beginning of period	698,869		$	19.39	643,117		$	17.48	888,855		$	15.25
Restricted shares awarded	435,025		24.09		239,523		18.07		168,018		26.41
Restricted stock units awarded	112,401		25.11		222,379		18.11		6,768		26.60
Restricted shares distributed	(274,784	)	19.04		(289,001	)	13.42		(270,142	)	13.38
Restricted stock units distributed	(13,761	)	18.87		(15,177	)	14.32		(9,934	)	11.19
Restricted shares forfeited	(236,388	)	23.10		(36,325	)	20.13		(140,448	)	22.97
Restricted stock units forfeited	(166,337	)	19.55		(65,647	)	18.18		—		—
Outstanding, end of period	555,025		$	22.79	698,869		$	19.39	643,117		$	17.48

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

The following table summarizes information about deferred stock unit activity during the years ended December 31, 2013, 2012 and 2011:

	For the Years Ended December 31,
	2013				2012				2011
	Deferred Stock Units		Weighted Average Award Date Fair Value		Deferred Stock Units		Weighted Average Award Date Fair Value		Deferred Stock Units		Weighted Average Award Date Fair Value
Outstanding, beginning of period	181,518		$	19.06	173,916		$	20.12	163,318		$	19.43
Awarded	39,966		22.33		41,734		17.78		31,238		23.75
Shares distributed	(7,029	)	22.67		(34,132	)	22.90		(20,640	)	20.13
Outstanding, end of period	214,455		$	19.56	181,518		$	19.06	173,916		$	20.12

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

A summary of stock option activity during the years ended December 31, 2013, 2012 and 2011 is as follows:

	Shares		Weighted Average Exercise Price		Shares		Weighted Average Exercise Price		Shares		Weighted Average Exercise Price
Outstanding at January 1	1,216,809		$	18.46	1,107,712		$	18.98	1,198,516		$	18.42
Granted	29,025		25.11		281,696		18.11		225,505		26.92
Exercised	(29,511	)	20.14		(52,676	)	16.66		(128,052	)	16.48
Canceled/Expired	(7,499	)	24.58		(119,923	)	23.21		(188,257	)	26.62
Outstanding at December 31	1,208,824		$	18.54	1,216,809		$	18.46	1,107,712		$	18.98
Exercisable at December 31	933,738		$	17.84	758,270		$	16.80	690,449		$	16.82

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

Financial data for stock option exercises are summarized in the following table (in thousands):

	Years Ended December 31,
	2013			2012		2011
Amount collected from stock option exercises	$	738		$	1,054	$	3,205
Total intrinsic value of stock option exercises	131			177		1,090
Tax benefit (expense) of stock option exercises recorded in additional paid-in-capital	(55		)	66		115
Aggregate intrinsic value of outstanding stock options	5,383			5,708		997
Aggregate intrinsic value of exercisable stock options	4,695			4,601		763

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

	2013		2012		2011
	Range	Weighted Average	Range	Weighted Average	Range	Weighted Average
Grant-date fair value	$12.92	$12.92	$8.14 - $8.19	$8.19	$11.61	$11.61
Volatility	49.8%	49.8%	43.0% - 45.2%	45.1%	47.0% - 50.6%	50.4%
Expected term (years)	7.0	7.0	7.0	7.0	7.0	7.0
Dividend yield	—%	—%	—%	—%	—%	—%
Risk-free rate	1.1%	1.1%	1.0% - 1.5%	1.5%	2.3% - 3.0%	2.8%