Note 9 - Business Segments (Details) - Reconciling Information Between Reportable Segments and Consolidated Totals (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2012
Reconciling Information Between Reportable Segments and Consolidated Totals [Abstract]
Operating income	$ 37,862	$ 24,383	$ 24,383	$ 45,546	$ 45,546	$ 49,048	$ 49,048
Interest income	87		336		128		724
Interest expense, net	(17,504)		(14,263)		(33,367)		(29,141)
Foreign currency translation and transaction gains (losses)	904		(1,756)		2,586		(1,742)
Income attributable to sale of tax benefits	5,783		2,589		9,315		5,106
Other non-operating income, net	29		286		1,446		122
Total income, before income taxes, discontinued operations and equity in income (losses) of investees	$ 27,161		$ 11,575		$ 25,654		$ 24,117