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Fair Value (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Fair Value on a Recurring Basis [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments $ 45,552 $ 54,642
Other long-term assets 1,344 3,216
Derivative financial instruments asset 472  
Life insurance contracts 41,328 41,707
Derivative financial instruments liability (76)  
Financial assets (liabilities) 88,620 99,565
Fair Value on a Recurring Basis [Member] | Level 1 [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments 45,552 54,642
Other long-term assets 1,344 3,216
Derivative financial instruments asset 0  
Life insurance contracts 0 0
Derivative financial instruments liability 0  
Financial assets (liabilities) 46,896 57,858
Fair Value on a Recurring Basis [Member] | Level 2 [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments 0 0
Other long-term assets 0 0
Derivative financial instruments asset 472  
Life insurance contracts 0 0
Derivative financial instruments liability (76)  
Financial assets (liabilities) 396 0
Fair Value on a Recurring Basis [Member] | Level 3 [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments 0 0
Other long-term assets 0 0
Derivative financial instruments asset 0  
Life insurance contracts 41,328 41,707
Derivative financial instruments liability 0  
Financial assets (liabilities) 41,328 $ 41,707
Life Insurance Contracts [Member]    
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward]    
Beginning balance 41,707  
Actual return on plan assets (379)  
Purchases and issuances 0  
Sales and settlements 0  
Transfers into Level 3 0  
Ending balance $ 41,328