Note 2 - Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

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

	Three months ended June 30,				Six months ended June 30,
	2012		2011		2012		2011
Non-Employee	$	6	$	4	$	11	$	8
ESPP	$	179		150		390		302
Restricted Stock	$	2,881		2,057		5,061		3,220
Stock Options	$	763		1,464		1,682		3,132
TOTAL	$	3,829	$	3,675	$	7,144	$	6,662

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

	Three months ended June 30,						Six months ended June 30,
	2012			2011			2012			2011
Expected term (years)		3.8			4.0			4.1			4.0
Expected volatility		53.4	%		53.0	%		53.4	%		52.9	%
Risk-free interest rate		0.6	%		1.3	%		0.6	%		1.4	%
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		830,931			18.22
Awards released		(235,159	)		17.66
Awards forfeited		(51,664	)		16.92
Outstanding at June 30, 2012		1,843,664		$	17.50		2.57

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

Available Shares as of December 31, 2011	3,693,210
2012 Additions	676,520
2012 Purchases	(97,247	)
Available Shares as of June 30, 2012	4,272,483

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

	Six months ended June 30,
	2012			2011
Expected term (years)		0.5			0.5
Expected volatility		50.7	%		37.5	%
Risk-free interest rate		0.1	%		0.2	%
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	(837,931	)
2012 Cancellations	110,705
Available for Grant as of June 30, 2012	5,205,812

Plan Status [Member]

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 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		(661,843	)		11.09
Options forfeited and expired		(59,041	)		20.69
Outstanding at June 30, 2012		4,149,355			15.91		3.08		18,556,231
Options exercisable at June 30, 2012 and expected to become exercisable		4,127,134			15.91		3.06		18,465,230
Options vested and exercisable at June 30, 2012		3,768,592		$	15.83		2.90	$	17,125,148