Note 11 - Long-Term Debt Schedule of Long Term Debt (Details) (USD $)	9 Months Ended			1 Months Ended													9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Senior Notes Due 2015	Sep. 30, 2014 Senior Notes Due 2015	Dec. 31, 2013 Senior Notes Due 2015	Sep. 30, 2014 Senior Notes Due 2017	Dec. 31, 2013 Senior Notes Due 2017	Sep. 30, 2014 Convertible Senior Notes Due 2017		Dec. 31, 2013 Convertible Senior Notes Due 2017		Sep. 30, 2014 Convertible Senior Notes Due 2019		Dec. 31, 2013 Convertible Senior Notes Due 2019		Sep. 30, 2014 Senior Notes Due 2019 [Member] basispoint	May 31, 2014 Senior Notes Due 2019 [Member]	Dec. 31, 2013 Senior Notes Due 2019 [Member]	Sep. 30, 2014 Total Long Term Debt	Dec. 31, 2013 Total Long Term Debt	Sep. 30, 2014 Convertible Debt [Member] Convertible Senior Notes Due 2017	Dec. 31, 2013 Convertible Debt [Member] Convertible Senior Notes Due 2017	Sep. 30, 2014 Convertible Debt [Member] Convertible Senior Notes Due 2019	Dec. 31, 2013 Convertible Debt [Member] Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					5.375%		9.00%		3.00%				2.25%				5.50%
Long-term debt	$ 1,201,069,000		$ 930,072,000		$ 0	$ 54,481,000	$ 192,348,000	$ 191,611,000	$ 369,737,000	[1]	$ 353,798,000	[1]	$ 338,984,000	[2]	$ 330,182,000	[2]	$ 300,000,000		$ 0	$ 1,201,069,000	$ 930,072,000	$ 369,737,000	$ 353,798,000	$ 338,985,000	$ 330,182,000
Long-term Debt, Gross																						450,000,000	450,000,000	400,000,000	400,000,000
Extinguishment of Debt, Amount				54,500,000
Repayments of Long-term Debt	57,223,000	79,372,000		57,200,000
Gains (Losses) on Extinguishment of Debt				(2,800,000)
Debt Instrument, Face Amount																		300,000,000
Proceeds from Issuance of Debt																	$ 293,800,000
PercentOfStockWithOrdinaryVotingRightsThatCompanyMustRetainInOrderToMakeAnyCapitalStockTransactionsUnderDebtCovenantAgreement																	80.00%
Debt Instrument, Redemption Price, Percentage																	100.00%
Number of Basis Points Added to Treasury Rate Used in Calculating Redemption Price of Debt																	50

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

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