Note 9 - Business Segments (Details) - Reconciling Information Between Reportable Segments and Consolidated Totals (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reconciling Information Between Reportable Segments and Consolidated Totals [Abstract]
Operating income	$ 43,788	$ 29,797	$ 108,689	$ 75,343
Interest income	35	742	236	870
Interest expense, net	(22,494)	(18,459)	(65,084)	(51,826)
Foreign currency translation and transaction gains (losses)	(2,946)	1,258	(3,639)	3,844
Income attributable to sale of tax benefits	5,487	5,027	18,334	14,342
Gain from sale of property, plant and equipment			7,628
Other non-operating income, net	243	137	649	1,583
Total income, before income taxes, discontinued operations and equity in income (losses) of investees	$ 24,113	$ 18,502	$ 66,813	$ 44,156