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Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Fair Value on a Recurring Basis [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments $ 32,326 $ 35,260
Other long-term assets 3,496 3,568
Life insurance contracts 38,516 35,590
Financial assets (liabilities), net 74,338 74,418
Fair Value on a Recurring Basis [Member] | Level 1 [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments 32,326 35,260
Other long-term assets 3,496 3,568
Life insurance contracts 0 0
Financial assets (liabilities), net 35,822 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 38,516 35,590
Financial assets (liabilities), net 38,516 $ 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 2,441  
Purchases and issuances 2,003  
Sales and settlements (1,518)  
Transfers into Level 3 0  
Ending balance $ 38,516