Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Narrative) (Details)

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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Assets and liabilities measured at fair value on a recurring basis      
Marketable securities in deferred compensation plan   $ 2,556 $ 3,027
Fair Value, Recurring | Deferred compensation plan | Trustees and Management      
Assets and liabilities measured at fair value on a recurring basis      
Maximum percentage of participants' compensation which is deferrable (as a percent) 100.00%    
Marketable securities in deferred compensation plan   $ 2,600 $ 3,000