Note 7 - Equity-based Compensation (Details) - Summary of Stock Award Activity (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock award activity [Rollforward]
Expense associated with stock awards	$ 3,600,000	$ 3,000,000	$ 4,100,000
Unrecognized pre-tax expense	$ 11,200,000
Remaining period for recognition	2 years 0 months 18 days
Stock Awards [Member]
Stock award activity [Rollforward]
Stock Awards - Outstanding				643,117
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)				$ 17.48
Stock Awards - Outstanding	767,540	555,025	698,869	643,117
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$ 21.93	$ 22.79	$ 19.39	$ 17.48
Restricted Stock [Member]
Stock award activity [Rollforward]
Stock Awards - Awarded	242,722	435,025	239,523
Weighted Average Award Date Fair Value - Awarded (in Dollars per share)	$ 23.76	$ 24.09	$ 18.07
Stock Awards - Distributed	(118,828)	(274,784)	(289,001)
Weighted Average Award Date Fair Value - Distributed (in Dollars per share)	$ 23.55	$ 19.04	$ 13.42
Stock Awards - Forfeited	(104,013)	(236,388)	(36,325)
Weighted Average Award Date Fair Value - Forfeited (in Dollars per share)	$ 23.77	$ 23.10	$ 20.13
Restricted Stock Units (RSUs) [Member]
Stock award activity [Rollforward]
Stock Awards - Awarded	395,352	112,401	222,379
Weighted Average Award Date Fair Value - Awarded (in Dollars per share)	$ 21.75	$ 25.11	$ 18.11
Stock Awards - Distributed	(15,277)	(13,761)	(15,177)
Weighted Average Award Date Fair Value - Distributed (in Dollars per share)	$ 21.25	$ 18.87	$ 14.32
Stock Awards - Forfeited	(187,441)	(166,337)	(65,647)
Weighted Average Award Date Fair Value - Forfeited (in Dollars per share)	$ 24.48	$ 19.55	$ 18.18

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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