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Note 6 - Accumulated Other Comprehensive Loss - Disclosure of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Beginning Balance $ 761,261  
Ending Balance 809,955  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Beginning Balance (18,832) $ (12,856)
Other comprehensive loss before reclassifications (933) 6,179
Amounts reclassified from AOCL
Other comprehensive income (loss) (933) 6,179
Ending Balance (19,765) (6,677)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning Balance (10,541) (10,978)
Other comprehensive loss before reclassifications
Amounts reclassified from AOCL
Other comprehensive income (loss)
Ending Balance (10,541) (10,978)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Beginning Balance 5,560 2,636
Other comprehensive loss before reclassifications (5,124) 6,647
Amounts reclassified from AOCL
Other comprehensive income (loss) (5,124) 6,647
Ending Balance 436 9,283
AOCI Attributable to Parent [Member]    
Beginning Balance (23,813) (21,198)
Other comprehensive loss before reclassifications (6,057) 12,826
Other comprehensive income (loss) (6,057) 12,826
Ending Balance $ (29,870) $ (8,372)