Note 13 - Long-Term Debt Schedule of Long Term Debt (Details) (USD $)	12 Months Ended														12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2010 7.75% Debentures due 2011 [Member]	Dec. 31, 2009 7.75% Debentures due 2011 [Member]	Dec. 31, 2011 7.75% Debentures due 2011 [Member]	May 01, 2001 7.75% Debentures due 2011 [Member]	Dec. 31, 2011 5.625% Senior Notes due 2013 [Member]	Dec. 31, 2010 5.625% Senior Notes due 2013 [Member]	Jan. 31, 2008 5.625% Senior Notes due 2013 [Member]	Feb. 01, 2003 5.625% Senior Notes due 2013 [Member]	Dec. 31, 2011 5.375% Senior Notes due 2015 [Member]	Dec. 31, 2010 5.375% Senior Notes due 2015 [Member]	Jun. 01, 2005 5.375% Senior Notes due 2015 [Member]	Dec. 31, 2010 3.00% Convertible Senior Notes due 2017 [Member]	Dec. 31, 2011 3.00% Convertible Senior Notes due 2017 [Member]	Nov. 01, 2010 3.00% Convertible Senior Notes due 2017 [Member]	Dec. 31, 2011 Total Long Term Debt [Member]	Dec. 31, 2010 Total Long Term Debt [Member]
Debt Instrument [Line Items]
Long-term debt	$ 818,584,000	$ 964,788,000		$ 160,344,000		$ 0		$ 252,267,000	$ 254,305,000			$ 249,819,000	$ 249,772,000		$ 300,367,000	$ 316,498,000		$ 818,584,000	$ 964,788,000
Debt Instrument, Interest Rate, Stated Percentage						7.75%	7.75%	5.625%			5.625%	5.375%		5.375%		3.00%	3.00%
Other Long Term Debt Details [Abstract]
Debt Instrument, Face Amount							250,000,000				250,000,000			250,000,000	450,000,000	450,000,000	450,000,000
Extinguishment of Debt, Amount				31,900,000	57,700,000
Amount Per Dollar of Principal of Debt Repurchased				$ 0.92	$ 0.79
Gains (Losses) on Extinguishment of Debt				2,500,000	12,000,000
Debt Instrument, Unamortized Premium										11,500,000
Proceeds from Issuance of Debt	$ 0	$ 391,310,000	$ 0												$ 391,300,000
Percent of Stock With Ordinary Voting Rights That the Company Must Retain In Order to Make Any Capital Stock Transactions Under Debt Covenant Agreement								80.00%				80.00%