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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Amounts Recognized in AOCI on Consolidated Balance Sheet) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net amount recognized $ (114,503) $ (118,392)    
Pension Plans, Defined Benefit [Member]        
Net Loss 127,307 134,717    
Prior Service Cost (Credit) 937 (456)    
Net amount recognized 128,244 134,261 $ 117,167 $ 161,667
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Net Loss 9,634 (21,750)    
Prior Service Cost (Credit) (23,375) 5,881    
Net amount recognized $ (13,741) $ (15,869) $ (18,447) $ (20,769)