Note 14 - Stock Incentive and Employee Benefit Plans (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 18,183,000	$ 14,134,000	$ 15,053,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years	2 years	1 year 328 days
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	$ 5,000
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 4,700,000	$ 3,600,000	$ 2,800,000
Independent Directors [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Stock Issued During Period, Shares, Share-based Compensation, Gross (in Shares)	13,498	12,174	9,454
Stock Appreciation Rights (SARs) [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	2,200,000	1,300,000	1,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Value Per Share Cap (in Dollars per share)	$ 20.00
Threshold Amount Used to Calculate the Cap Amount of Value Per Share (in Dollars per share)			$ 60.00
Restricted Stock [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	133,616	94,590	63,529
Stock Options and Stock Appreciation Rights [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in Shares)	4,696,072
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	2 years 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 5,000,000	$ 2,500,000	$ 3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	37,500,000	$ 12,600,000	$ 23,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	31,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	26,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 31,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 5.30	$ 4.95	$ 4.30
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 7,216,000	$ 6,777,000	$ 5,260,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 36 days	2 years 36 days	1 year 328 days
Performance Shares [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)	348,756	45,583	44,691
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 5,117,000	$ 3,267,000	$ 7,320,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years	1 year 255 days	1 year 292 days
Performance Shares [Member] \| 2015 PSAs [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 73 days
Performance Shares [Member] \| 2014 PSAs [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 73 days
Performance Shares [Member] \| 2013 PSAs [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 100,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	73 days
Performance Shares [Member] \| 2015 TSR PSAs [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 73 days
Performance Shares [Member] \| 2014 TSR PSAs [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 73 days
Minimum [Member] \| Employee Stock Option [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	5 years
Minimum [Member] \| Stock Appreciation Rights (SARs) [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	5 years
Maximum [Member] \| Employee Stock Option [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Maximum [Member] \| Stock Appreciation Rights (SARs) [Member]
Note 14 - Stock Incentive and Employee Benefit Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years

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The maximum value per share over the grant price of equity-based compensation awards outstanding. Excludes stock and unit options.

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Unrecognized cost of unvested share-based compensation awards.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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