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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reconciling Information Between Reportable Segments and Consolidated Totals [Abstract]
Operating income	$ 22,330	$ 37,862	$ 64,901	$ 45,546
Interest income	90	87	201	128
Interest expense, net	(22,072)	(17,504)	(42,590)	(33,367)
Foreign currency translation and transaction gains (losses)	(55)	904	(693)	2,586
Income attributable to sale of tax benefits	6,130	5,783	12,847	9,315
Gain from sale of property, plant and equipment	7,628		7,628
Other non-operating income, net	343	29	406	1,446
Total income, before income taxes, discontinued operations and equity in income (losses) of investees	$ 14,394	$ 27,161	$ 42,700	$ 25,654