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Employee benefits - Plan assets by fair value hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 878,785 $ 799,935  
Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 194,442 178,983  
Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 334,524 312,688  
Equity securities - Common stocks      
Defined Benefit Plan Disclosure      
Fair value of plan assets 101,081 116,254  
Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 132,238 87,642  
Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Fair value of plan assets 98,431 82,030  
Mutual Funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 4,526 4,490  
Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 5,777  
Private Equity investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets 70 74  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 9,626 7,401  
Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Fair value of plan assets 3,847 4,596  
Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 204,716 175,738  
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 101,081 116,254  
Level 1 | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 94,009 52,083  
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 | Mortgage Backed Securities      
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 9,626 7,401  
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 556,164 522,528  
Level 2 | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 187,065 171,744  
Level 2 | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 326,344 304,958  
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 38,229 35,559  
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 4,526 4,490  
Level 2 | Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 5,777  
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 3,917 4,670 $ 5,092
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 | Mortgage Backed Securities      
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 70 74  
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 3,847 4,596  
Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 113,988 96,999  
Measured at NAV | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 7,377 7,239  
Measured at NAV | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 8,180 7,730  
Measured at NAV | Equity securities - Common stocks      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Measured at NAV | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Measured at NAV | Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Fair value of plan assets 98,431 82,030  
Measured at NAV | Mutual Funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Measured at NAV | Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Measured at NAV | Private Equity investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Measured at NAV | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Measured at NAV | Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 0 $ 0