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Shareholders' Equity Details 1 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (265,406) $ (354,998) $ (266,649)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 1,678 (47,788)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 1,424 (513) 13,221
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 71,890 (52,043)  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 273 4,735 8,261
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent 14,600 11,995  
Other Comprehensive Income (Loss), Net of Tax 89,592 (88,349)  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax (31,340) (115,322) (57,394)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 0 0  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 0  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 83,982 (57,928)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 0 0  
Other Comprehensive Income (Loss), Net of Tax 83,982 (57,928)  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax (1,081) (2,232) 3,016
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 0 0  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 1,424 (513)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax (273) (4,735)  
Other Comprehensive Income (Loss), Net of Tax 1,151 (5,248)  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax (232,985) (237,444) $ (212,271)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 1,678 (47,788)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax 0 0  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (12,092) 5,885  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax 14,873 16,730  
Other Comprehensive Income (Loss), Net of Tax $ 4,459 $ (25,173)