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Other Comprehensive Income Details 2 (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ (3,462) $ (1,442) $ (2,640) $ 819
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax (252) 18 (112) 454
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax (3,210) (1,460) (2,528) 365
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent 4,651 5,053 14,150 15,128
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent 1,064 1,319 3,313 3,947
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 3,587 3,716 10,837 11,181
Interest Rate Swap [Member]        
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 97 424 531 1,273
Cross Currency Swap [Member]        
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (3,559) $ (1,866) (3,171) $ (454)
Foreign Currency Transaction Gain (Loss), Unrealized 2,900   1,000  
Interest Income, Other $ 800   $ 2,200