Note 10 - Long-Term Debt Schedule of Liability and Equity Components of Convertible Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Long-term debt, net	$ 1,218,972		$ 1,209,926
Equity component of currently redeemable convertible senior notes	68,982		74,690
Convertible Senior Notes Due 2017
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Long-term debt, net	381,018	[1]	375,310	[1]
Convertible Senior Notes Due 2017 | Convertible Debt [Member]
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Principal amount of convertible debt in liabilities	450,000		450,000
Less: debt discount, net (1)	(68,982)	[2]	(74,690)	[2]
Long-term debt, net	381,018		375,310
Equity component of currently redeemable convertible senior notes	68,982		74,690
Convertible Senior Notes Due 2019
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Long-term debt, net	345,084	[3]	342,011	[3]
Convertible Senior Notes Due 2019 | Convertible Debt [Member]
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Principal amount of convertible debt in liabilities	400,000		400,000
Less: debt discount, net (1)	(54,916)	[2]	(57,989)	[2]
Long-term debt, net	345,084		342,011
Equity component of currently redeemable convertible senior notes	$ 0		$ 0

[1] The principal amount of these notes is $450 million.

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

[3] The principal amount of these notes is $400 million.