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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Cumulative currency translation adjustments $ (58,405) $ (77,299)
Unrealized gain on cash flow hedges, net of taxes of $4,918 and $1,207 11,932 2,740
Retirement benefits, net of taxes of ($74) and ($342) 763 (498)
Accumulated other comprehensive loss (45,710) (75,057)
Unrealized gain on cash flow hedges, taxes 4,918 1,207
Retirement benefits, taxes $ (74) $ (342)