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Retirement Plans (Quantitative Disclosures of Retirement Income Plan's Invested Assets that are Measured at Fair Value on a Recurring Basis) (Details) - Retirement Income Plan [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Total Assets $ 385,087 $ 331,680 $ 363,673
Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 386,920 331,834  
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 383,851 300,725  
Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,215 1,482  
Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Global Equity [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 113,212 113,409  
Global Equity [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 113,212 113,409  
Global Equity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Global Equity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Diversified Credit [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 59,009    
Diversified Credit [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 59,009    
Diversified Credit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0    
Diversified Credit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0    
Real Assets Equity [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 57,414    
Real Assets Equity [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 57,414    
Real Assets Equity [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0    
Real Assets Equity [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0    
Total Equities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 229,635    
Total Equities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 229,635    
Total Equities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0    
Total Equities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0    
Real Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   16,818  
Real Assets [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 228    
Real Assets [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Real Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Real Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Equity Funds [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   878  
Private Equity Funds [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 583    
Private Equity Funds [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Equity Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Credit Funds [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   262  
Private Credit Funds [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 43    
Private Credit Funds [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Credit Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Private Credit Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Hedge Funds [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   7,889  
Hedge Funds [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Hedge Funds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Hedge Funds [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 854 25,847  
Alternative Investments [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Alternative Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Alternative Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] | Alternative Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1] 0 0  
Other Private Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   3,780  
Other Private Assets [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Other Private Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Other Private Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Total Private Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   29,627  
Total Private Assets [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Total Private Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Total Private Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets [1]   0  
Return Seeking Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 230,489 143,036  
Return Seeking Assets [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 229,635 113,409  
Return Seeking Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Return Seeking Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Fixed Income Securities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 114,395 106,000  
Fixed Income Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 114,395 106,000  
Fixed Income Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Fixed Income Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
US Treasury Securities [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 30,997 18,528  
US Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 30,997 18,528  
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
US Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Short-term Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 8,824 62,788  
Short-term Investments [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 8,824 62,788  
Short-term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Short-term Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Deposit Administration Contracts [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,215 1,482  
Deposit Administration Contracts [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Deposit Administration Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,215 1,482  
Deposit Administration Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Liability Hedging Assets [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 145,392 124,528  
Liability Hedging Assets [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 145,392 124,528  
Liability Hedging Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Liability Hedging Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 0 0  
Cash And Short Term Investments [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 11,039 64,270  
Cash And Short Term Investments [Member] | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 8,824 62,788  
Cash And Short Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets 2,215 1,482  
Cash And Short Term Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair value, recurring [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total Assets $ 0 $ 0  
[1] In accordance with ASU 2015-07, certain investments that are measured at fair value using the net asset value per share (or its practical expedient) have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to total Pension Plan invested assets.