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Pension and Other Postretirement Benefits Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fixed Income Pension Assets $ 2,781    
Pension Plan [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 287,895 $ 252,115  
Plan Asset Receivable Or Payable Accrued Interest And Dividend Income 30 451  
Plan Asset Receivable Or Payable Due From Broker Securities Sold 0 5,170  
Total Pension Plan Asset Receivables 30 5,621  
Plan Asset Receivable Or Payable Due From Broker Securities Purchased 0 22  
Defined Benefit Plan, Fair Value of Plan Assets 287,925 257,714 $ 249,338
Pension Plan [Member] | Domestic Large Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 102,851 55,496  
Pension Plan [Member] | Domestic Small/Mid Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 16,423 28,861  
Pension Plan [Member] | Foreign Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 77,286 47,750  
Pension Plan [Member] | Emerging Market Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 28,743 13,457  
Pension Plan [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables   6,719  
Pension Plan [Member] | Government Or Credit Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 33,081 52,915  
Pension Plan [Member] | High Yield Bond Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 2,777 14,072  
Pension Plan [Member] | Emerging Market Debt [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 12,605 8,504  
Pension Plan [Member] | Real Estate Funds [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 5,544 18,739  
Pension Plan [Member] | Absolute Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 189    
Pension Plan [Member] | Real Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables   3,111  
Pension Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 5,615 2,491  
Non-published Net Asset Value [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fixed Income Pension Assets 2,781    
Non-published Net Asset Value [Member] | Pension Plan [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 266,602 108,420  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Domestic Large Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 102,851 5,655  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Domestic Small/Mid Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 16,423 10,232  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Foreign Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 56,075 25,346  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Emerging Market Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 28,743 13,457  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets   6,719  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Government Or Credit Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 33,081 17,960  
Non-published Net Asset Value [Member] | Pension Plan [Member] | High Yield Bond Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 2,777 14,072  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Emerging Market Debt [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 12,605 8,504  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Real Estate Funds [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 5,544 882  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Absolute Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 189    
Non-published Net Asset Value [Member] | Pension Plan [Member] | Real Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets   3,111  
Non-published Net Asset Value [Member] | Pension Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 5,533 2,482  
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fixed Income Pension Assets 0    
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 21,293 108,740  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Domestic Large Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 49,841  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Domestic Small/Mid Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 18,629  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Foreign Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 21,211 22,404  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Emerging Market Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Government Or Credit Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | High Yield Bond Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Emerging Market Debt [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Real Estate Funds [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 17,857  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Absolute Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0    
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Real Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 82 9  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fixed Income Pension Assets 0    
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 0 34,955  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Domestic Large Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Domestic Small/Mid Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Foreign Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Emerging Market Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Government Or Credit Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 34,955  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | High Yield Bond Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Emerging Market Debt [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Real Estate Funds [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Absolute Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0    
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Real Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fixed Income Pension Assets 0    
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Total Pension Asset Investments Net Of Receivables And Payables 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Domestic Large Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Domestic Small/Mid Cap Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Foreign Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Emerging Market Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Government Or Credit Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | High Yield Bond Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Emerging Market Debt [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Real Estate Funds [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Absolute Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets 0    
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Real Return Strategy Investment Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets   0  
Fair Value, Inputs, Level 3 [Member] | Pension Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Fair Value of Plan Assets $ 0 $ 0