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Other Comprehensive Income Details 2 (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Cross Currency Swap, Interest Income $ 0.6   $ 0.6  
Cross Currency Swap Debt Remeasurement Effective Portion (1.3)   0.2  
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (1,442,000) $ (1,343,000) 819,000 $ (3,748,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 18,000 (229,000) 454,000 (627,000)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax (1,460,000) (1,114,000) 365,000 (3,121,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent 5,035,000 3,996,000 15,128,000 19,964,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent 1,319,000 1,033,000 3,947,000 6,166,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 3,716,000 2,963,000 11,181,000 13,798,000
Interest Rate Swap [Member]        
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 424,000 258,000 1,273,000 784,000
Cross Currency Swap [Member]        
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net (1,866,000) 0 (454,000) 0
Foreign Exchange Forward [Member]        
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 0 $ (1,601,000) $ 0 $ (4,532,000)