Note 11 - Long-Term Debt Schedule of Long Term Debt (Details) (USD $)	2 Months Ended	6 Months Ended
	Feb. 23, 2012	Sep. 30, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt		$ 659,119,000		$ 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		79,609,000		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	15,200,000	1,000,000
Extinguishment of Debt, Amount		24,100,000
5.375% Senior Notes due 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.375%
Long-term debt		249,855,000		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		329,655,000	[1]	316,498,000	[1]
Debt Instrument, Face Amount		$ 450,000,000		$ 450,000,000

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