Note 20 - Incentive Plans (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 20 - Incentive Plans (Details) [Line Items]
Allocated Share-based Compensation Expense		$ 18,500,000	$ 17,900,000	$ 18,900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 28,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		3 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)		9,095,416	9,251,021	8,049,534
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in Dollars per share)		$ 11.54
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in Dollars per share)		$ 53.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		3 years 73 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		2 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term		6 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in Shares)		756,441
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in Dollars per share)		$ 20.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value		$ 4,600,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options		18,700,000	$ 23,900,000	$ 30,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 7,400,000	9,400,000	$ 7,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate				3.85%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		5.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount		$ 170,000
Defined Contribution Plan, Cost Recognized		2,100,000	2,200,000	$ 2,100,000
Employee [Member]
Note 20 - Incentive Plans (Details) [Line Items]
Severance Costs		$ 4,800,000	$ 6,300,000	$ 4,300,000
Restricted Stock [Member]
Note 20 - Incentive Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in Shares)		1,712,534	1,911,145	1,591,082
Dividends, Share-based Compensation, Stock		$ 1,800,000	$ 1,500,000	$ 1,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)		$ 25.98	$ 21.60	$ 21.58
Performance Shares [Member]
Note 20 - Incentive Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in Shares)		202,754	171,400	185,200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)		$ 27.87	$ 22.65	$ 24.78
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	[1]	0.00%	0.00%	0.00%

[1] Total Shareholder Returns, as used in the performance share awards computation, are measured based on cumulative dividend stock prices, as such a zero percent dividend yield is utilized.