Note 11 - Long-Term Debt Schedule of Long Term Debt (Details) (USD $)	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt		$ 666,806,000			$ 818,584,000
5.625% Senior Notes due 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.625%
Long-term debt		91,800,000			252,267,000
Aggregate Principal Amount of Long Term Debt Tendered Through Modifiied Dutch Auction Tender Offer				146,500,000
Price Per Principal Amount Tendered Through Modified Dutch Auction Tender Offer				900
Principal Amount of Note Used as Basis for Determining Tender Cap Range of Purchase				1,000
Percent of Principal Amount of Notes Purchased in Modified Dutch Auction Tender Offer for Long Term Debt				59.00%
Gains (Losses) on Extinguishment of Debt		700,000		15,200,000
Extinguishment of Debt, Amount	12,000,000	12,200,000
5.375% Senior Notes due 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.375%
Long-term debt		249,843,000			249,819,000
3.00% Convertible Senior Notes due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.00%
Long-term debt		325,163,000	[1]		316,498,000	[1]
Debt Instrument, Face Amount		$ 450,000,000

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