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Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value on a Recurring Basis [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments $ 35,260 $ 36,531
Other long-term assets 3,568 3,726
Forward contracts 0 158
Life insurance contracts 35,590 37,737
Financial assets (liabilities), net 74,418 78,152
Restricted current investments 11,300 11,800
Fair Value on a Recurring Basis [Member] | Level 1 [Member]    
Financial Assets (Liabilities) [Abstract]    
Cash equivalents and current investments 35,260 36,531
Other long-term assets 3,568 3,726
Forward contracts 0 0
Life insurance contracts 0 0
Financial assets (liabilities), net 38,828 40,257
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
Forward contracts 0 158
Life insurance contracts 0 0
Financial assets (liabilities), net 0 158
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
Forward contracts 0 0
Life insurance contracts 35,590 37,737
Financial assets (liabilities), net 35,590 37,737
Life Insurance Contracts [Member]    
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward]    
Beginning balance 37,737 32,287
Actual return on plan assets (1,788) 4,917
Purchases and issuances 0 895
Sales and settlements (359) (362)
Transfers into Level 3 0 0
Ending balance $ 35,590 $ 37,737