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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Assets:      
Money market funds $ 1,716 $ 89,767 $ 1,625
Trading securities associated with deferred compensation plans 15,115 17,519 17,386
Interest rate swap agreements 6,075 8,262 4,516
Forward foreign currency exchange contracts 697 360 379
Total financial assets measured and reported at fair value 23,603 115,908 23,906
Liabilities:      
Guarantees of bank loans to tobacco growers 784 974 1,149
Forward foreign currency exchange contracts 34 392 15
Total financial liabilities measured and reported at fair value 818 1,366 1,164
Net Asset Value [Member]      
Assets:      
Money market funds 1,716 89,767 1,625
Trading securities associated with deferred compensation plans 0 0 0
Interest rate swap agreements 0 0 0
Forward foreign currency exchange contracts 0 0 0
Total financial assets measured and reported at fair value 1,716 89,767 1,625
Liabilities:      
Guarantees of bank loans to tobacco growers 0 0 0
Forward foreign currency exchange contracts 0 0 0
Total financial liabilities measured and reported at fair value 0 0 0
Level 1 [Member]      
Assets:      
Money market funds 0 0 0
Trading securities associated with deferred compensation plans 15,115 17,519 17,386
Interest rate swap agreements 0 0 0
Forward foreign currency exchange contracts 0 0 0
Total financial assets measured and reported at fair value 15,115 17,519 17,386
Liabilities:      
Guarantees of bank loans to tobacco growers 0 0 0
Forward foreign currency exchange contracts 0 0 0
Total financial liabilities measured and reported at fair value 0 0 0
Level 2 [Member]      
Assets:      
Money market funds 0 0 0
Trading securities associated with deferred compensation plans 0 0 0
Interest rate swap agreements 6,075 8,262 4,516
Forward foreign currency exchange contracts 697 360 379
Total financial assets measured and reported at fair value 6,772 8,622 4,895
Liabilities:      
Guarantees of bank loans to tobacco growers 0 0 0
Forward foreign currency exchange contracts 34 392 15
Total financial liabilities measured and reported at fair value 34 392 15
Level 3 [Member]      
Assets:      
Money market funds 0 0 0
Trading securities associated with deferred compensation plans 0 0 0
Interest rate swap agreements 0 0 0
Forward foreign currency exchange contracts 0 0 0
Total financial assets measured and reported at fair value 0 0 0
Liabilities:      
Guarantees of bank loans to tobacco growers 784 974 1,149
Forward foreign currency exchange contracts 0 0 0
Total financial liabilities measured and reported at fair value $ 784 $ 974 $ 1,149