Note 2 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense	$ 5,231	$ 4,182	$ 15,081	$ 11,326
Tax benefit	(80)	(59)	(175)	(172)
	5,151	4,123	14,906	11,154
Non Employee [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense		6		17
Employee Stock Purchase Program [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense	129	88	460	478
Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense	4,894	3,447	13,800	8,508
Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense	$ 208	$ 641	$ 821	$ 2,323