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Note 2 - Stock-Based Compensation (Detail) - Stock Based Compensation Plan Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Based Compensation Expense	$ 4,660	$ 3,315
Non Employee [Member]
Stock Based Compensation Expense		5
Employee Stock Purchase Program [Member]
Stock Based Compensation Expense	192	211
Restricted Stock [Member]
Stock Based Compensation Expense	4,134	2,180
Stock Options [Member]
Stock Based Compensation Expense	$ 334	$ 919

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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