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Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value on a Recurring Basis [Member]    
Financial Assets [Abstract]    
Cash equivalents and current investments $ 54,642 $ 35,260
Other long-term assets 3,216 3,568
Life insurance contracts 41,707 35,590
Financial assets 99,565 74,418
Restricted current investments 8,400 11,300
Fair Value on a Recurring Basis [Member] | Level 1 [Member]    
Financial Assets [Abstract]    
Cash equivalents and current investments 54,642 35,260
Other long-term assets 3,216 3,568
Life insurance contracts 0 0
Financial assets 57,858 38,828
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 41,707 35,590
Financial assets 41,707 35,590
Life Insurance Contracts [Member]    
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward]    
Beginning balance 35,590 37,737
Actual return on plan assets 5,688 (1,788)
Purchases and issuances 2,003 0
Sales and settlements (1,574) (359)
Transfers into Level 3 0 0
Ending balance $ 41,707 $ 35,590