Note 2 - Stock-Based Compensation (Details) - Stock Based Compensation Plan Expenses (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense	$ 5,190	$ 3,829	$ 9,850	$ 7,144
Non Employee [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense		6		11
Employee Stock Purchase Program [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense	139	179	331	390
Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense	4,772	2,881	8,906	5,061
Employee Stock Option [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Based Compensation Expense	$ 279	$ 763	$ 613	$ 1,682