Note 15 - Selected Financial Information of Registrant Selected Financial Information of Registrant (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Assets	$ 5,959,691	$ 5,621,691	$ 5,758,573
Long-term debt	1,201,069	930,072
Liabilities	4,225,290	4,682,046
Stockholders' Equity Attributable to Parent	1,734,401	939,645
Liabilities and Equity	5,959,691	5,621,691
Parent Company
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries, at equity in net assets	2,107,572	1,419,360
Assets	3,102,058	2,112,495
Long-term debt	1,201,069	930,072
Liabilities	1,367,657	1,172,850
Stockholders' Equity Attributable to Parent	1,734,401	939,645
Liabilities and Equity	$ 3,102,058	$ 2,112,495