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Fair Value Measurement (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Assets and Liabilities Measured on Recurring Basis
The following tables provide the assets carried at fair value and measured on a recurring basis:
  Fair Value Measurements at Reporting Date Using:
(in thousands)December 31, 2021Quoted Prices in
Active Markets
(Level 1)		Significant Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Assets
Cash equivalents$87,620 $87,620 $— $— 
Short-term investments$361 $— $361 $— 
Deferred compensation plan investments$1,602 $1,602 $— $— 
Equity securities$2,500 $2,500 $— $— 

 Fair Value Measurements at Reporting Date Using:
(in thousands)December 31, 2020Quoted Prices in
Active Markets
(Level 1)		Significant Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Assets
Cash equivalents$341,085 $341,085 $— $— 
Short-term investments$479 $— $479 $— 
Deferred compensation plan investments$1,602 $1,602 $— $—