Note 15 - Selected Financial Information of Registrant Selected Financial Information of Registrant (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Assets	$ 5,932,551	$ 5,621,691	$ 6,054,000
Long-term debt	1,192,397	930,072
Liabilities	4,348,304	4,682,046
Stockholders' Equity Attributable to Parent	1,584,247	939,645
Liabilities and Equity	5,932,551	5,621,691
Parent Company
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries, at equity in net assets	1,928,280	1,419,360
Assets	2,935,489	2,112,495
Long-term debt	1,192,397	930,072
Liabilities	1,351,242	1,172,850
Stockholders' Equity Attributable to Parent	1,584,247	939,645
Liabilities and Equity	$ 2,935,489	$ 2,112,495