Note 3 - Share-based Compensation (Details) - Components of Share-based Compensation (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]
Pretax compensation expense			$ 23,602	$ 21,979
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	4,467	4,628	18,764	18,272
Tax benefit	1,709	1,770	7,153	6,989
Stock option expense, net of tax	2,758	2,858	11,611	11,283
Performance Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	1,001	698	4,161	2,947
Tax benefit	383	267	1,586	1,127
Stock option expense, net of tax	618	431	2,575	1,820
Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	156	264	677	760
Tax benefit	60	101	258	291
Stock option expense, net of tax	$ 96	$ 163	$ 419	$ 469