Note 10 - Long-Term Debt Schedule of Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 938,390		$ 930,072
Senior Notes Due 2015
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.375%
Long-term debt	54,484		54,481
Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.00%
Long-term debt	191,850		191,611
Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.00%
Long-term debt	358,985	[1]	353,798	[1]
Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Long-term debt	333,071	[2]	330,182	[2]
Total Long Term Debt
Debt Instrument [Line Items]
Long-term debt	938,390		930,072
Convertible Debt [Member] | Convertible Senior Notes Due 2017
Debt Instrument [Line Items]
Long-term debt	358,984		353,798
Long-term Debt, Gross	450,000		450,000
Convertible Debt [Member] | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Long-term debt	333,071		330,182
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.