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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax $ 1,081 $ 2,994 $ (6,992) $ 12,110        
Accumulated Other Comprehensive Income (Loss), Net of Tax (26,098) (49,699) (26,098) (49,699) $ (29,450) $ (53,801) $ (58,929) $ (73,914)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 3,349 9,214 (21,651) 24,170        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     49,346          
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 3 16 8 45        
Other Comprehensive Income (Loss), Foreign Currency Translation, Gain (Loss), Reclassification Adjustment from AOCI, after Tax     (15,935)          
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax 1 6 2 17        
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (23,319) (47,255) (23,319) (47,255) (26,668) (51,014) (56,469) (71,425)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 3,349 9,214 (21,651) 24,170        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     49,346          
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 0 0 0 0        
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (2,779) (2,444) (2,779) (2,444) $ (2,782) $ (2,787) $ (2,460) $ (2,489)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0 0 0        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     0          
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax $ 3 $ 16 $ 8 $ 45