Fair Value Measurements and Financial Instruments Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities	$ 37,062	$ 25,518
Marketable equity securities	12,102	18,110
Revolving credit facility, noncurrent	141,616	150,433
Long-term debt, excluding current maturities	283,177	230,768
Assets invested for self-insurance	20,959	24,828
United States Government and agency securities
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities	36,802	25,254
Corporate notes and bonds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities	260	264
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		25,518
Marketable equity securities	12,102	18,110
Deferred compensation	0	0
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 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	1,572	0
Fair value measurements, recurring [Member] | Certificates of Deposit | Quoted prices in active markets, (level 1)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, noncurrent	3,500	6,359
Assets invested for self-insurance	2,859	3,750
Fair value measurements, recurring [Member] | Certificates of Deposit | Significant other observable inputs, (level 2)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, noncurrent	0	0
Assets invested for self-insurance	0	0
Fair value measurements, recurring [Member] | Certificates of Deposit | Significant unobservable inputs, (level 3)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, noncurrent	0	0
Assets invested for self-insurance	0	0
Fair value measurements, recurring [Member] | United States Government and agency securities | 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	36,802	25,254
Fair value measurements, recurring [Member] | United States Government and agency securities | 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
Fair value measurements, recurring [Member] | United States Government and agency securities | 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
Fair value measurements, recurring [Member] | Corporate notes and bonds | 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	260	264
Fair value measurements, recurring [Member] | Corporate notes and bonds | 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
Fair value measurements, recurring [Member] | Corporate notes and bonds | 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
Fair value measurements, recurring [Member] | Mutual funds | Quoted prices in active markets, (level 1)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	6,842	13,873
Fair value measurements, recurring [Member] | Mutual funds | Significant other observable inputs, (level 2)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	0	0
Fair value measurements, recurring [Member] | Mutual funds | Significant unobservable inputs, (level 3)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	0	0
Fair value measurements, recurring [Member] | Common shares | Quoted prices in active markets, (level 1)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	3,780	3,007
Fair value measurements, recurring [Member] | Common shares | Significant other observable inputs, (level 2)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	0	0
Fair value measurements, recurring [Member] | Common shares | Significant unobservable inputs, (level 3)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	0	0
Fair value measurements, recurring [Member] | Exchange traded funds | Quoted prices in active markets, (level 1)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	1,480	1,230
Fair value measurements, recurring [Member] | Exchange traded funds | Significant other observable inputs, (level 2)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	0	0
Fair value measurements, recurring [Member] | Exchange traded funds | Significant unobservable inputs, (level 3)
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	0	0
Total carrying value
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities	37,062	25,518
Marketable equity securities	12,102	18,110
Revolving credit facility, noncurrent	141,616	150,433
Senior unsecured notes	135,000	75,000
Term loans, noncurrent	7,012	5,854
Long-term debt, excluding current maturities	283,628	231,287
Total carrying value | Fair value measurements, recurring [Member]
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities	37,062	25,518
Marketable equity securities	12,102	18,110
Deferred compensation	1,572	4,597
Total carrying value | Fair value measurements, recurring [Member] | Certificates of Deposit
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Certificates of deposits, noncurrent	3,500	6,359
Assets invested for self-insurance	2,859	3,750
Total carrying value | Fair value measurements, recurring [Member] | United States Government and agency securities
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities	36,802	25,254
Total carrying value | Fair value measurements, recurring [Member] | Corporate notes and bonds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities	260	264
Total carrying value | Fair value measurements, recurring [Member] | Mutual funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	6,842	13,873
Total carrying value | Fair value measurements, recurring [Member] | Common shares
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	3,780	3,007
Total carrying value | Fair value measurements, recurring [Member] | Exchange traded funds
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Marketable equity securities	1,480	1,230
Fair value
Fair value, assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Available-for-sale debt securities	37,062	25,518
Marketable equity securities	12,102	18,110
Revolving credit facility, noncurrent	141,616	150,433
Senior unsecured notes	130,959	74,968
Term loans, noncurrent	7,252	5,610
Long-term debt, excluding current maturities	$ 279,827	$ 231,011