Note 12 - Long-Term Debt Schedule of Liability and Equity Components of Convertible Debt (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt		$ 1,027,074	$ 1,069,537
Convertible Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt		0	20,947
Convertible Senior Notes Due 2017 [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Principal amount of convertible debt in liabilities		0	22,233
Less: debt discount, net (1)	[1]	0	(1,221)
Unamortized Debt Issuance Expense	[1]	0	(65)
Long-term debt		0	20,947
Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt		0	62,013
Convertible Senior Notes Due 2019 [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Principal amount of convertible debt in liabilities		0	68,024
Less: debt discount, net (1)	[1]	0	(5,461)
Unamortized Debt Issuance Expense	[1]	0	(550)
Long-term debt		$ 0	$ 62,013

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