Note 10 - Long-Term Debt Schedule of Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 1,218,972		$ 1,209,926
Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.00%
Long-term debt	192,870		192,605
Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.00%
Long-term debt	381,018	[1]	375,310	[1]
Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Long-term debt	345,084	[2]	342,011	[2]
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Long-term debt	300,000		300,000
Total Long Term Debt
Debt Instrument [Line Items]
Long-term debt	1,218,972		1,209,926
Convertible Debt [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Long-term debt	381,018		375,310
Long-term Debt, Gross	450,000		450,000
Convertible Debt [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Long-term debt	345,084		342,011
Long-term Debt, Gross	$ 400,000		$ 400,000

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

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