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Fair Value Measures and Disclosures (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents—Money market mutual funds $ 0 $ 0
Equity Securities, FV-NI, Noncurrent 102,529 1,127
Trading securities held in a "rabbi trust" 179 139
Total assets 102,708 1,266
Deferred compensation accrual "rabbi trust" 188 148
Total liabilities 188 148
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents—Money market mutual funds 0 0
Equity Securities, FV-NI, Noncurrent 174 1,127
Trading securities held in a "rabbi trust" 179 139
Total assets 353 1,266
Deferred compensation accrual "rabbi trust" 188 148
Total liabilities 188 148
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents—Money market mutual funds 0 0
Equity Securities, FV-NI, Noncurrent 0 0
Trading securities held in a "rabbi trust" 0 0
Total assets 0 0
Deferred compensation accrual "rabbi trust" 0 0
Total liabilities 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents—Money market mutual funds 0 0
Equity Securities, FV-NI, Noncurrent 102,355 0
Trading securities held in a "rabbi trust" 0 0
Total assets 102,355 0
Deferred compensation accrual "rabbi trust" 0 0
Total liabilities $ 0 $ 0