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Shareholders' Equity (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance $ 351,576 $ 286,890 $ 457,587
Balance 496,142 351,576 286,890
Accumulated Other Comprehensive Income (Losses) [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance (441,649) (424,263) (302,467)
Other comprehensive loss before reclassifications 10,324 (29,014) (108,027)
Net loss reclassified from accumulated other comprehensive loss to consolidated statement of income 1,978 11,628 (13,769)
Net current-period other comprehensive (loss) income 12,302 (17,386) (121,796)
Balance (429,347) (441,649) (424,263)
Foreign Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance (441,081) (431,190) (302,889)
Other comprehensive loss before reclassifications 4,800 (9,891) (128,301)
Net loss reclassified from accumulated other comprehensive loss to consolidated statement of income 0 0 0
Net current-period other comprehensive (loss) income 4,800 (9,891) (128,301)
Balance (436,281) (441,081) (431,190)
Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance 305 7,876 1,598
Other comprehensive loss before reclassifications 6,462 (18,813) 20,487
Net loss reclassified from accumulated other comprehensive loss to consolidated statement of income 1,592 11,242 (14,209)
Net current-period other comprehensive (loss) income 8,054 (7,571) 6,278
Balance 8,359 305 7,876
Post-Employment Benefits [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance (873) (949) (1,176)
Other comprehensive loss before reclassifications (938) (310) (213)
Net loss reclassified from accumulated other comprehensive loss to consolidated statement of income 386 386 440
Net current-period other comprehensive (loss) income (552) 76 227
Balance $ (1,425) $ (873) $ (949)