Fair Value Measurements and Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, current	$ 20,658	$ 24,828
Available-for-sale debt securities:	40,610	25,518
Marketable equity securities:	10,276	18,110
United States Government and agency securities
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	40,090	25,254
Corporate notes and bonds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	520	264
Total carrying value
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	40,610	25,518
Marketable equity securities:		18,110
Fair value, measurements, recurring [Member] | Total carrying value
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	40,610	25,518
Marketable equity securities:	10,276	18,110
Deferred compensation	1,488	4,597
Fair value, measurements, recurring [Member] | Total carrying value | Certificates of deposit
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, current	2,359	3,750
Certificates of deposits, noncurrent	4,750	6,359
Fair value, measurements, recurring [Member] | Total carrying value | United States Government and agency securities
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	40,090	25,254
Fair value, measurements, recurring [Member] | Total carrying value | Corporate notes and bonds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	520	264
Fair value, measurements, recurring [Member] | Total carrying value | Mutual funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	5,558	13,873
Fair value, measurements, recurring [Member] | Total carrying value | Common stock
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	3,385	3,007
Fair value, measurements, recurring [Member] | Total carrying value | Exchange traded funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	1,333	1,230
Fair value, measurements, recurring [Member] | Quoted prices in active markets (level 1)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	40,610	25,518
Marketable equity securities:	10,276	18,110
Deferred compensation	0	0
Fair value, measurements, recurring [Member] | Quoted prices in active markets (level 1) | Certificates of deposit
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, current	2,359	3,750
Certificates of deposits, noncurrent	4,750	6,359
Fair value, measurements, recurring [Member] | Quoted prices in active markets (level 1) | United States Government and agency securities
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	40,090	25,254
Fair value, measurements, recurring [Member] | Quoted prices in active markets (level 1) | Corporate notes and bonds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	520	264
Fair value, measurements, recurring [Member] | Quoted prices in active markets (level 1) | Mutual funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	5,558	13,873
Fair value, measurements, recurring [Member] | Quoted prices in active markets (level 1) | Common stock
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	3,385	3,007
Fair value, measurements, recurring [Member] | Quoted prices in active markets (level 1) | Exchange traded funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	1,333	1,230
Fair value, measurements, recurring [Member] | Significant other observable inputs (level 2)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	0	0
Marketable equity securities:	0	0
Deferred compensation	0	4,597
Fair value, measurements, recurring [Member] | Significant other observable inputs (level 2) | Certificates of deposit
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, current	0	0
Certificates of deposits, noncurrent	0	0
Fair value, measurements, recurring [Member] | Significant other observable inputs (level 2) | United States Government and agency securities
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	0	0
Fair value, measurements, recurring [Member] | Significant other observable inputs (level 2) | Corporate notes and bonds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	0	0
Fair value, measurements, recurring [Member] | Significant other observable inputs (level 2) | Mutual funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	0	0
Fair value, measurements, recurring [Member] | Significant other observable inputs (level 2) | Common stock
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	0	0
Fair value, measurements, recurring [Member] | Significant other observable inputs (level 2) | Exchange traded funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	0	0
Fair value, measurements, recurring [Member] | Significant unobservable inputs (level 3)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	0	0
Marketable equity securities:	0	0
Deferred compensation	1,488	0
Fair value, measurements, recurring [Member] | Significant unobservable inputs (level 3) | Certificates of deposit
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, current	0	0
Certificates of deposits, noncurrent	0	0
Fair value, measurements, recurring [Member] | Significant unobservable inputs (level 3) | United States Government and agency securities
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	0	0
Fair value, measurements, recurring [Member] | Significant unobservable inputs (level 3) | Corporate notes and bonds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities:	0	0
Fair value, measurements, recurring [Member] | Significant unobservable inputs (level 3) | Mutual funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	0	0
Fair value, measurements, recurring [Member] | Significant unobservable inputs (level 3) | Common stock
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	0	0
Fair value, measurements, recurring [Member] | Significant unobservable inputs (level 3) | Exchange traded funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities:	$ 0	$ 0