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Fair value measurement - Schedule of Fair Value of Pension Plan Assets by Level Within Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets $ 1,495,213 $ 1,661,378  
Liabilities (1,525) (1,676)  
Other liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Liabilities (1,525) (1,676)  
Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 1,468,437 1,627,726  
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 122,916 121,359  
Liabilities (1,525) (1,676)  
Level 1 | Other liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Liabilities (1,525) (1,676)  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 1,076,414 1,210,101  
Liabilities 0 0  
Level 2 | Other liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Liabilities 0 0  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 269,107 296,266 $ 352,130
Liabilities 0 0  
Level 3 | Other liabilities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Liabilities 0 0  
Cash and cash equivalents | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 10,132 12,684  
Cash and cash equivalents | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 8,201 10,989  
Cash and cash equivalents | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 1,931 1,695  
Cash and cash equivalents | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Corporate common stock | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 66,017 66,725  
Corporate common stock | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 66,017 66,725  
Corporate common stock | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Corporate common stock | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Corporate and government bonds | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 166,200 231,518  
Corporate and government bonds | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Corporate and government bonds | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 166,200 231,518  
Corporate and government bonds | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets $ 0 $ 0  
Real estate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible Enumeration] Instruments measured at NAV using the practical expedient: Instruments measured at NAV using the practical expedient:  
Real estate | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets $ 106,365 $ 124,790  
Real estate | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Real estate | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Real estate | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 106,365 124,790 133,503
Real estate | Instruments measured at NAV using the practical expedient:      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 9,011 8,814  
Mutual funds | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 48,698 20,430  
Mutual funds | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 48,698 20,430  
Mutual funds | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Mutual funds | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Exchange traded funds | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets   23,215  
Exchange traded funds | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets   23,215  
Exchange traded funds | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets   0  
Exchange traded funds | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets   0  
Equities | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 76,553 255,382  
Equities | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Equities | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 76,553 255,382  
Equities | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets $ 0 $ 0  
Fixed income      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible Enumeration] Instruments measured at NAV using the practical expedient: Instruments measured at NAV using the practical expedient:  
Fixed income | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets $ 831,730 $ 721,506  
Fixed income | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Fixed income | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 831,730 721,506  
Fixed income | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Fixed income | Instruments measured at NAV using the practical expedient:      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets $ 16,961 $ 23,163  
Partnership/joint venture interests      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible Enumeration] Instruments measured at NAV using the practical expedient: Instruments measured at NAV using the practical expedient:  
Partnership/joint venture interests | Total      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets $ 162,742 $ 171,476  
Partnership/joint venture interests | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Partnership/joint venture interests | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 0 0  
Partnership/joint venture interests | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets 162,742 171,476 169,932
Partnership/joint venture interests | Instruments measured at NAV using the practical expedient:      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets $ 804 1,675  
Hedge funds | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Assets   $ 0 $ 48,695