Note 2 - Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Note 2 - Stock-Based Compensation (Tables) [Line Items]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Non-employee	$	-		$	6		$	-		$	17
Employee stock purchase plan		129			88			460			478
Restricted stock		4,894			3,447			13,800			8,508
Stock options		208			641			821			2,323
Tax benefit		(80	)		(59	)		(175	)		(172	)
	$	5,151		$	4,123		$	14,906		$	11,154

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

	RSUs			Weighted Average Grant Date Fair Value Per Share		PSUs			Weighted Average Grant Date Fair Value Per Share		Total			Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Recognition Period (Years)
Outstanding at January 1, 2013		1,098,563		$	16.96		531,185		$	18.49		1,629,748		$	17.46		2.18
Awards granted		252,388			23.74		311,542			24.35		563,930			24.08
Performance awards adjustment (1)		-			-		375,509			21.73		375,509			21.73
Awards released		(397,209	)		17.42		(206,409	)		18.90		(603,618	)		17.93
Awards forfeited		(109,822	)		17.03		(42,757	)		18.91		(152,579	)		17.55
Outstanding at September 30, 2013		843,920			18.76		969,070			21.52		1,812,990			20.24		1.88

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

Available shares as of January 1, 2013	4,217,960
Additions to plan	713,466
Purchases	(111,002	)
Available shares as of September 30, 2013	4,820,424

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

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Expected term (years)		0.5			0.5			0.5			0.5
Expected volatility		27.5	%		39.6	%		28.0	%		45.8	%
Risk-free interest rate		0.1	%		0.1	%		0.1	%		0.1	%
Dividend yield		-			-			-			-

Unit Activity [Member]

Note 2 - Stock-Based Compensation (Tables) [Line Items]

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

Available for grants as of January 1, 2013	4,957,244
Additions to plan	1,783,664
Grants	(563,930	)
Performance awards adjustment (1)	(375,509	)
Cancellations	161,747
Available for grant as of September 30, 2013	5,963,216

Plan Status [Member]

Note 2 - Stock-Based Compensation (Tables) [Line Items]

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

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at January 1, 2013 (3,603,762 options exercisable at a weighted-average exercise price of $15.59 per share)		3,813,361		$	15.62		2.56	$	25,379,573
Options granted		-			-
Options exercised		(2,106,632	)		15.50
Options forfeited and expired		(9,168	)		16.87
Outstanding at September 30, 2013		1,697,561			15.76		2.01		24,670,713
Options exercisable at September 30, 2013 and expected to become exercisable		1,693,071			15.77		2.00		24,594,612
Options vested and exercisable at September 30, 2013		1,592,588			15.82		1.85		23,044,939