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Shareholders' Equity Details 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity Note [Abstract]      
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ (1,679) $ 1,034  
Cross Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 1,416 0  
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 0 6,756  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 263 5,722  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 536 (987)  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax (273) (4,735) $ (8,261)
Amortization of actuarial (gains) losses and plan amendments and prior service cost 20,137 23,925  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent 5,264 7,195  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax $ 14,873 $ 16,730