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Note 8 - Accumulated Other Comprehensive Loss - Schedule of Reclassifications of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net periodic pension cost $ (28,886) $ (39,365)
Associated income tax (expense) benefit 221 532
Reclassifications for the period (3,868) (9,583)
Gain (loss) on cash flow hedges 29,666 33,928
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassifications for the period (82) (21)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Net periodic pension cost (81) (71)
Associated income tax (expense) benefit 4 4
Reclassifications for the period (77) (67)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Associated income tax (expense) benefit 3 (28)
Reclassifications for the period (5) 46
Gain (loss) on cash flow hedges $ (8) $ 74