Note 15 - Senior Notes (Details) (USD $)	6 Months Ended			3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Mar. 31, 2014 5.5% Senior Notes Due 2024 [Member]	Mar. 31, 2014 5.375% Senior Notes Due December 2014 [Member]	Dec. 31, 2013 5.375% Senior Notes Due December 2014 [Member]
Note 15 - Senior Notes (Details) [Line Items]
Proceeds from Issuance of Senior Long-term Debt	$ 248,375,000	$ 346,938,000		$ 250,000,000
Proceeds from Debt, Net of Issuance Costs				248,400,000
Debt Issuance Cost				1,600,000
Early Repayment of Senior Debt					259,100,000
Debt Instrument, Face Amount					250,000,000
Long-term Debt, Gross	1,096,112,000		1,095,620,000		249,700,000	249,814,000
Gains (Losses) on Extinguishment of Debt	$ (9,412,000)				$ (9,400,000)