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Employee benefits - Plan assets by fair value hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 799,935 $ 685,823  
Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 178,983 172,969  
Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 312,688 263,644  
Equity securities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 116,254 90,175  
Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 87,642 69,029  
Foreign Commingled Trust Fund      
Defined Benefit Plan Disclosure      
Fair value of plan assets 82,030 59,362  
Mutual Funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 4,490 3,630  
Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 5,777 11,349  
Private Equity investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets 74 68  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 7,401 10,573  
Accrued Income Receivable      
Defined Benefit Plan Disclosure      
Fair value of plan assets 4,596 5,024  
Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 175,738 140,142  
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      
Defined Benefit Plan Disclosure      
Fair value of plan assets 116,254 90,175  
Level 1 | Equity securities - ETF's      
Defined Benefit Plan Disclosure      
Fair value of plan assets 52,083 39,394  
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 7,401 10,573  
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 522,528 467,103  
Level 2 | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 171,744 165,832  
Level 2 | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 304,958 256,657  
Level 2 | Equity securities      
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 35,559 29,635  
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 4,490 3,630  
Level 2 | Mortgage Backed Securities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 5,777 11,349  
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 4,670 5,092 $ 4,758
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      
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 74 68  
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 4,596 5,024  
Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 96,999 73,486  
Measured at NAV | Obligations of U.S. Government sponsored entities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 7,239 7,137  
Measured at NAV | Corporate bonds and debentures      
Defined Benefit Plan Disclosure      
Fair value of plan assets 7,730 6,987  
Measured at NAV | Equity securities      
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 82,030 59,362  
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