Note 14 - Selected Financial Information of Registrant Selected Financial Information of Registrant (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Assets	$ 5,528,985	$ 5,621,691	$ 6,370,949
Long-term debt	938,390	930,072
Liabilities	4,382,402	4,682,046
Equity component of currently redeemable convertible senior notes	91,016	0
Stockholders' Equity Attributable to Parent	1,055,567	939,645
Liabilities and Equity	5,528,985	5,621,691
Parent Company
Condensed Financial Statements, Captions [Line Items]
Investments in subsidiaries, at equity in net assets	1,721,213	1,419,360
Assets	2,318,631	2,112,495
Long-term debt	938,390	930,072
Liabilities	1,172,048	1,172,850
Equity component of currently redeemable convertible senior notes	91,016	0
Stockholders' Equity Attributable to Parent	1,055,567	939,645
Liabilities and Equity	$ 2,318,631	$ 2,112,495