PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - SCHEDULE OF PENSION PLAN ASSETS WITHIN THE FAIR VALUE HIERARCHY (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | $ 1,098,191 | $ 1,100,245 | $ 1,053,438 |
Fair Value, Measurements, Recurring | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 1,098,191 | 1,100,245 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 1,073,942 | 1,078,345 | |
Fair Value, Measurements, Recurring | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 534 | 613 | |
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 23,715 | 21,287 | |
Fair Value, Measurements, Recurring | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Cash and cash equivalents | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 24,898 | 22,476 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 649 | 576 | |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 534 | 613 | |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 23,715 | 21,287 | |
Fair Value, Measurements, Recurring | Cash and cash equivalents | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Global all-cap | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 294,090 | 264,909 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 294,090 | 264,909 | |
Fair Value, Measurements, Recurring | Global all-cap | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Global all-cap | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Global all-cap | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | U.S. government/agency | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 248,579 | 215,573 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 248,579 | 215,573 | |
Fair Value, Measurements, Recurring | U.S. government/agency | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | U.S. government/agency | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | U.S. government/agency | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Corporate bonds | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 78,360 | 155,648 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 78,360 | 155,648 | |
Fair Value, Measurements, Recurring | Corporate bonds | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Corporate bonds | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Corporate bonds | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | International government/corporate bonds | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 31,922 | 32,586 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 31,922 | 32,586 | |
Fair Value, Measurements, Recurring | International government/corporate bonds | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | International government/corporate bonds | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | International government/corporate bonds | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Diversified credit | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 154,004 | 160,829 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 154,004 | 160,829 | |
Fair Value, Measurements, Recurring | Diversified credit | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Diversified credit | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Diversified credit | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Global diversified assets | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 97,412 | 117,290 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 97,412 | 117,290 | |
Fair Value, Measurements, Recurring | Global diversified assets | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Global diversified assets | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Global diversified assets | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | |
Fair Value, Measurements, Recurring | Global real estate investment trusts | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 60,083 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | | 60,083 | |
Fair Value, Measurements, Recurring | Global real estate investment trusts | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 0 | |
Fair Value, Measurements, Recurring | Global real estate investment trusts | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 0 | |
Fair Value, Measurements, Recurring | Global real estate investment trusts | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 0 | |
Fair Value, Measurements, Recurring | Global infrastructure | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 70,851 | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | | 70,851 | |
Fair Value, Measurements, Recurring | Global infrastructure | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 0 | |
Fair Value, Measurements, Recurring | Global infrastructure | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | 0 | |
Fair Value, Measurements, Recurring | Global infrastructure | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | | $ 0 | |
Fair Value, Measurements, Recurring | Real Assets Fund | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 168,926 | | |
Defined Benefit Plan, Plan Assets Measured at Net Asset Value | 168,926 | | |
Fair Value, Measurements, Recurring | Real Assets Fund | Quoted prices in active markets of identical assets (Level 1) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | | |
Fair Value, Measurements, Recurring | Real Assets Fund | Significant other observable inputs (Level 2) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | 0 | | |
Fair Value, Measurements, Recurring | Real Assets Fund | Significant other unobservable inputs (Level 3) | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | | |