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Accumulated Other Comprehensive Loss (Changes In Accumulated Other Comprehensive Loss by Component, Net of Tax) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balances $ 376,631    
Ending Balances 360,376 $ 376,631  
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balances (105,361) (75,468) $ (106,643)
Other comprehensive income (loss) before reclassifications, before tax 3,538 (13,270) 28,200
Reclassification to earnings: Cash flow hedge loss, before tax (10,162) (17,159) (527)
Reclassification to earnings: Postretirement benefit liabilities gain (loss), before tax 91 (55) 42
Current period other comprehensive income (loss), before tax (6,533) (30,484) 27,715
Tax effect (2,518) (591) (3,460)
Current period other comprehensive income (loss), net of tax (4,015) (29,893) 31,175
Ending Balances (109,376) (105,361) (75,468)
Postretirement Benefit Liability Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balances 1,126 1,165 1,141
Other comprehensive income (loss) before reclassifications, before tax
Reclassification to earnings: Cash flow hedge loss, before tax
Reclassification to earnings: Postretirement benefit liabilities gain (loss), before tax 91 (55) 42
Current period other comprehensive income (loss), before tax 91 (55) 42
Tax effect 11 (16) 18
Current period other comprehensive income (loss), net of tax 80 (39) 24
Ending Balances 1,206 1,126 1,165
Foreign Currency Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balances (103,190) (77,578) (107,784)
Other comprehensive income (loss) before reclassifications, before tax 6,269 (24,658) 26,181
Reclassification to earnings: Cash flow hedge loss, before tax
Reclassification to earnings: Postretirement benefit liabilities gain (loss), before tax
Current period other comprehensive income (loss), before tax 6,269 (24,658) 26,181
Tax effect 654 954 (4,025)
Current period other comprehensive income (loss), net of tax 5,615 (25,612) 30,206
Ending Balances (97,575) (103,190) (77,578)
Net Gain (Loss) On Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balances (3,297) 945
Other comprehensive income (loss) before reclassifications, before tax (2,731) 11,388 2,019
Reclassification to earnings: Cash flow hedge loss, before tax (10,162) (17,159) (527)
Reclassification to earnings: Postretirement benefit liabilities gain (loss), before tax
Current period other comprehensive income (loss), before tax (12,893) (5,771) 1,492
Tax effect (3,183) (1,529) 547
Current period other comprehensive income (loss), net of tax (9,710) (4,242) 945
Ending Balances $ (13,007) $ (3,297) $ 945