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Note 9 - Business Segments (Details) - Reconciling Information Between Reportable Segments and Consolidated Totals - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue:        
Revenue $ 140,487 $ 127,603 $ 260,718 $ 270,039
Operating income:        
Operating income 38,643 22,330 68,494 64,901
Interest income 44 90 53 201
Interest expense, net (18,859) (22,072) (36,687) (42,590)
Foreign currency translation and transaction gains (losses) (571) (55) (1,937) (693)
Income attributable to sale of equity interest 4,731 6,130 10,283 12,847
Gain from sale of property, plant and equipment   7,628 (531) 7,628
Other non-operating income (expense), net (1,675) 343 (1,392) 406
Total consolidated income before income taxes and equity in income of investees 22,313 14,394 38,814 42,700
Total Segment Revenues [Member]        
Revenue:        
Revenue 140,487 127,603 260,718 270,039
Intersegment Eliminations [Member]        
Revenue:        
Revenue 10,900 15,742 30,657 36,336
Consolidation, Eliminations [Member]        
Revenue:        
Revenue $ (10,900) $ (15,742) $ (30,657) $ (36,336)