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Fair Value (Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure $ 6,116   $ 6,116     $ 7,000    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income 6 $ 0 $ 16 $ (8)        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis    
The following tables present a reconciliation of the beginning and ending balances of the Level 3 inputs for the three-month and the six-month periods ended June 30, 2023 and 2022, for financial instruments measured on a recurring basis and classified as Level 3:

Level 3 Fair Value Measurements
Three months ended June 30, 2023 and 2022
(In thousands)Corporate Debt SecuritiesEquity securitiesFair value
swap
Balance at April 1, 2023$6,855 $449 $(121)
Transfer into (out of) level 3, net(611)  
Total (losses) / gains  
Included in other income / other expense 6 (175)
    Included in other comprehensive income(128)  
Balance at June 30, 2023$6,116 $455 $(296)
Balance at April 1, 2022$— $491 $(226)
Total losses  
Included in other income / other expense— — (221)
Balance at June 30, 2022$— $491 $(447)
Level 3 Fair Value Measurements
Six months ended June 30, 2023 and 2022
(In thousands)Corporate Debt SecuritiesEquity securitiesFair value
swap
Balance at January 1, 2023$7,000 $439 $(243)
Transfers into (out of) level 3, net11   
Total (losses) / gains  
Included in other income / other expense 16 (175)
    Included in other comprehensive income(895)  
Purchases, sales, issuances and settlements, other, net  122 
Balance at June 30, 2023$6,116 $455 $(296)
Balance at January 1, 2022$— $499 $(226)
Total losses  
Included in other income / other expense— (8)(221)
Balance at June 30, 2022$— $491 $(447)
         
Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income   0            
Swap [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Included in other comprehensive income   (221)            
Corporate Debt Securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 15,508   $ 15,508     16,472    
Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 2,720   2,720     1,859    
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (128)   (895)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 (611)   11          
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Investments, Fair Value Disclosure 455   455     439    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 455 491 455 491 $ 449 439 $ 491 $ 499
Balance, ending 455 491 455 491 449 439 491 499
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Swap [Member]                
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning (296) (447) (296) (447) (121) (243) (226) (226)
Included in other comprehensive income (175)   (175) (221)        
Balance, ending (296) (447) (296) (447) (121) (243) (226) (226)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements)     122          
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Balance, beginning 6,116 0 6,116 0 6,855 7,000 0 0
Balance, ending $ 6,116 $ 0 $ 6,116 $ 0 $ 6,855 $ 7,000 $ 0 $ 0