Note 10 - Long-Term Debt Schedule of Liability and Equity Components of Convertible Debt (Details) - Type of Adoption [Domain] - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Long-term debt, net		$ 1,224,892	$ 1,192,299
Equity component of currently redeemable convertible senior notes		8,546	74,690
Convertible Senior Notes Due 2017
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Principal amount of convertible debt in liabilities		60,914	450,000
Less: Debt discount, net (1)	[1]	(8,546)	(74,690)
Less: Debt issuance costs (1)	[1]	(451)	(3,974)
Long-term debt, net		51,917	371,336
Equity component of currently redeemable convertible senior notes		8,546	74,690
Convertible Senior Notes Due 2019
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Principal amount of convertible debt in liabilities		399,992	400,000
Less: Debt discount, net (1)	[1]	(51,793)	(57,989)
Less: Debt issuance costs (1)	[1]	(5,219)	(5,878)
Long-term debt, net		342,980	336,133
Equity component of currently redeemable convertible senior notes		$ 0	$ 0

[1] Included within long-term debt and is being amortized over the life of the convertible notes.