Note 3 - Share-based Compensation (Details) - Components of Share-Based Compensation Program Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	$ 9,972	$ 9,137
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	7,760	7,203
Tax benefit	2,957	2,755
Expense, net of tax	4,803	4,448
Performance Shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	2,115	1,571
Tax benefit	806	601
Expense, net of tax	1,309	970
Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Pretax compensation expense	97	363
Tax benefit	37	139
Expense, net of tax	$ 60	$ 224