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Employee benefits - Plan assets by fair value hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 860,484 $ 878,785  
Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 197,636 194,442  
Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 384,360 334,524  
Equity securities - Common stocks      
Defined Benefit Plan Disclosure      
Fair value of plan assets 41,414 101,081  
Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 136,811 132,238  
Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Fair value of plan assets 82,912 98,431  
Mutual Funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 5,262 4,526  
Private Equity investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets 56 70  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 7,523 9,626  
Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Fair value of plan assets 4,510 3,847  
Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 160,302 204,716  
Level 1 | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 1 | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 1 | Equity securities - Common stocks      
Defined Benefit Plan Disclosure      
Fair value of plan assets 41,414 101,081  
Level 1 | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 111,365 94,009  
Level 1 | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 1 | Mutual Funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 1 | Private Equity investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 7,523 9,626  
Level 1 | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 415,842 556,164  
Level 2 | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 9,259 187,065  
Level 2 | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 375,875 326,344  
Level 2 | Equity securities - Common stocks      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 2 | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 25,446 38,229  
Level 2 | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 2 | Mutual Funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 5,262 4,526  
Level 2 | Private Equity investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 2 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 2 | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 4,566 3,917 $ 4,670
Level 3 | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 3 | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 3 | Equity securities - Common stocks      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 3 | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 3 | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 3 | Mutual Funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 3 | Private Equity investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets 56 70  
Level 3 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Level 3 | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Fair value of plan assets 4,510 3,847  
NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 279,774 113,988  
NAV | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 188,377 7,377  
NAV | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 8,485 8,180  
NAV | Equity securities - Common stocks      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
NAV | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
NAV | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Fair value of plan assets 82,912 98,431  
NAV | Mutual Funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
NAV | Private Equity investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
NAV | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
NAV | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 0 $ 0