Note 10 - Long-Term Debt Schedule of Liability and Equity Components of Convertible Debt (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt, net		$ 1,286,466	$ 1,219,454
Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Equity component of currently redeemable convertible senior notes		5,000	11,300
Long-term debt, net		19,931	46,115
Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Equity component of currently redeemable convertible senior notes		19,600	75,100
Long-term debt, net		89,785	341,214
Convertible Debt [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Principal amount of convertible debt in liabilities		22,233	52,370
Less: Debt discount, net (1)	[1]	(2,187)	(5,941)
Less: Debt issuance costs (1)	[1]	(115)	(314)
Long-term debt, net		19,931	46,115
Convertible Debt [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Principal amount of convertible debt in liabilities		101,581	389,992
Less: Debt discount, net (1)	[1]	(10,716)	(44,313)
Less: Debt issuance costs (1)	[1]	(1,080)	(4,465)
Long-term debt, net		$ 89,785	$ 341,214

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