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Pension and Other Postretirement Benefit Plans - Summary of Fair Value of LPP Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Money market mutual fund      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value $ 8,017 $ 4,506  
Real estate      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 8,735 9,948  
Common Collective Trusts | Foreign equity securities      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 263,244 265,495  
Common Collective Trusts | U.S. equity securities      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 65,257 58,315  
Level 1, 2 and 3      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 345,253 338,264  
Level 1      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 8,017 4,506  
Level 1 | Money market mutual fund      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 8,017 4,506  
Level 1 | Real estate      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 0 0  
Level 1 | Common Collective Trusts | Foreign equity securities      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 0 0  
Level 1 | Common Collective Trusts | U.S. equity securities      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 0 0  
Level 2      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 328,501 323,810  
Level 2 | Money market mutual fund      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 0 0  
Level 2 | Real estate      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 0 0  
Level 2 | Common Collective Trusts | Foreign equity securities      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 263,244 265,495  
Level 2 | Common Collective Trusts | U.S. equity securities      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 65,257 58,315  
Level 3      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 8,735 9,948  
Level 3 | Money market mutual fund      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 0 0  
Level 3 | Real estate      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 8,735 9,948 $ 20,836
Level 3 | Common Collective Trusts | Foreign equity securities      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value 0 0  
Level 3 | Common Collective Trusts | U.S. equity securities      
Defined Benefit Plan And Other Postretirement Benefit Plan Table Text Block [Line Items]      
Total assets at fair value $ 0 $ 0