Note 11 - Long-Term Debt Schedule of Liability and Equity Components of Convertible Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Long-term debt	$ 1,209,926		$ 930,072
Debt Instrument, Convertible, Gross Amount of Equity Component	74,690		0
Convertible Senior Notes Due 2017
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Long-term debt	375,310	[1]	353,798	[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)	(74,690)	[2]	(96,202)	[2]
Long-term debt	375,310		353,798
Debt Instrument, Convertible, Gross Amount of Equity Component	74,690		0
Equity component (net of tax impact) (2)	(9,011)	[3],[4]	65,679	[3]
Convertible Senior Notes Due 2019
Schedule of Liability and Equity Components of Convertible Debt [Line Items]
Long-term debt	342,011	[5]	330,182	[5]
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)	(57,989)	[2]	(69,818)	[2]
Long-term debt	342,011		330,182
Debt Instrument, Convertible, Gross Amount of Equity Component	0		0
Equity component (net of tax impact) (2)	77,026	[3],[6]	77,026	[3],[6]
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	$ 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] Amount included within additional paid-in capital, net of the capped call transactions (Convertible Senior Notes due 2017) and related issuance costs (Convertible Senior Notes due 2017 and 2019).

[4] Primarily represents the deferred tax amount related to this transaction due to the reclassification of the debt discount to temporary equity.

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

[6] There was no net tax impact recorded in equity related to the Convertible Senior Notes due 2019, as a result of our full valuation allowance at the time the debt was issued.