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Pension and Other Postretirement Benefit Plans - Summary of change in Plan Assets Valued Using Significant Unobservable Inputs (level 3) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of assets, beginning balance $ 312,455  
Fair value of assets, ending balance 338,264 $ 312,455
Fair Value, Inputs, Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of assets, beginning balance 20,836  
Fair value of assets, ending balance 9,948 20,836
Real Estate    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of assets, beginning balance 20,836  
Contributions 331 307
Net distributions 11,235 307
Advisory fee 205 198
Net investment income 771 845
Unrealized gain (541) 717
Net realized gain (9) 17
Fair value of assets, ending balance 9,948 20,836
Real Estate | Fair Value, Inputs, Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of assets, beginning balance 20,836 19,455
Fair value of assets, ending balance $ 9,948 $ 20,836