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Fair Value (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Fair Value on a Recurring Basis [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments $ 37,082 $ 35,260
Other long-term assets 3,886 3,568
Life insurance contracts 39,585 35,590
Financial assets (liabilities), net 80,553 74,418
Fair Value on a Recurring Basis [Member] | Level 1 [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments 37,082 35,260
Other long-term assets 3,886 3,568
Life insurance contracts 0 0
Financial assets (liabilities), net 40,968 38,828
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
Life insurance contracts 0 0
Financial assets (liabilities), net 0 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
Life insurance contracts 39,585 35,590
Financial assets (liabilities), net 39,585 $ 35,590
Life Insurance Contracts [Member]    
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward]    
Beginning balance 35,590  
Actual return on plan assets 3,566  
Purchases and issuances 2,003  
Sales and settlements (1,574)  
Transfers into Level 3 0  
Ending balance $ 39,585