Note 2 - Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2012

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,
	2012		2011		2012		2011
Non-Employee	$	6	$	2	$	17	$	10
ESPP		88		99		478		401
Restricted Stock		3,447		2,058		8,508		5,278
Stock Options		641		1,215		2,323		4,347
TOTAL	$	4,182	$	3,374	$	11,326	$	10,036

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

	Three months ended September 30,						Nine months ended September 30,
	2012			2011			2012			2011
Expected term (years)		4.1			4.1			4.1			4.0
Expected volatility		52.1	%		52.3	%		53.4	%		52.8	%
Risk-free interest rate		0.5	%		1.1	%		0.6	%		1.3	%
Dividend yield		-			-			-			-

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

	Restricted Stock Units			Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Recognition Period (Years)
Outstanding at December 31, 2011		1,299,556		$	16.87		2.71
Awards granted		870,931			18.20
Awards released		(400,319	)		18.06
Awards forfeited		(64,664	)		16.77
Outstanding at September 30, 2012		1,705,504		$	17.27		2.41

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

Available Shares as of December 31, 2011	3,693,210
2012 Additions to Plan	676,520
2012 Purchases	(151,770	)
Available Shares as of September 30, 2012	4,217,960

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used

	Three months ended September 30,						Nine months ended September 30,
	2012			2011			2012			2011
Expected term (years)		0.5			0.5			0.5			0.5
Expected volatility		39.6	%		40.9	%		45.8	%		39.2	%
Risk-free interest rate		0.1	%		0.1	%		0.1	%		0.1	%
Dividend yield		-			-			-			-

Unit Activity [Member]

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

Available for Grant as of December 31, 2011	4,291,737
2012 Additions to Plan	1,641,301
2012 Grants	(877,931	)
2012 Cancellations	137,934
Available for Grant as of September 30, 2012	5,193,041

Plan Status [Member]

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

						Weighted
						Average
				Weighted		Remaining
				Average		Contractual		Aggregate
	Stock Options			Exercise Price		Term (Years)		Intrinsic Value
Outstanding at December 31, 2011 (4,202,786 options exercisable at a weighted-average exercise price of $15.05 per share)		4,863,239		$	15.31		3.44	$	8,817,049
Options granted (weighted-average fair value of $6.69 per share)		7,000			15.96
Options exercised		(1,053,687	)		11.61
Options forfeited and expired		(73,270	)		20.85
Outstanding at September 30, 2012		3,743,282			16.24		2.80		15,375,791
Options exercisable at September 30, 2012 and expected to become exercisable		3,726,760			16.25		2.79		15,306,445
Options vested and exercisable at September 30, 2012		3,472,405		$	16.21		2.64	$	14,395,333