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Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Fair Value on a Recurring Basis [Member]    
Financial Assets [Abstract]    
Cash equivalents and current investments $ 49,670 $ 54,642
Other long-term assets 202 3,216
Life insurance contracts 35,339 41,707
Financial assets 85,211 99,565
Fair Value on a Recurring Basis [Member] | Level 1 [Member]    
Financial Assets [Abstract]    
Cash equivalents and current investments 49,670 54,642
Other long-term assets 202 3,216
Life insurance contracts 0 0
Financial assets 49,872 57,858
Fair Value on a Recurring Basis [Member] | Level 2 [Member]    
Financial Assets [Abstract]    
Cash equivalents and current investments 0 0
Other long-term assets 0 0
Life insurance contracts 0 0
Financial assets 0 0
Fair Value on a Recurring Basis [Member] | Level 3 [Member]    
Financial Assets [Abstract]    
Cash equivalents and current investments 0 0
Other long-term assets 0 0
Life insurance contracts 35,339 41,707
Financial assets 35,339 $ 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 (6,368)  
Purchases and issuances 0  
Sales and settlements 0  
Transfers into Level 3 0  
Ending balance $ 35,339