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Fair Value Measurements and Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Assets and liabilities measured at fair value on a recurring basis [Table Text Block]
Our assets and liabilities measured at fair value on a recurring basis at September 30, 2023 were as follows:
  
Fair Value Measurements at
September 30, 2023 Using:
Assets and Liabilities Recorded at
Fair Value on a Recurring Basis
Total
Carrying
Value at
September 30, 2023
Quoted
Prices in
Active
Markets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Assets:
Assets invested for self-insurance
Certificates of deposits, current$2,359 $2,359 $— $— 
Certificates of deposits, noncurrent4,750 4,750 — — 
Available-for-sale debt securities:
United States Government and agency securities40,090 40,090 — — 
Corporate notes and bonds520 520 — — 
Total available-for-sale debt securities40,610 40,610 — — 
Marketable equity securities:
Mutual funds5,558 5,558 — — 
Corporate stocks3,385 3,385 — — 
Exchange traded funds1,333 1,333 — — 
Total marketable equity securities10,276 10,276 — — 
Liabilities:
Deferred compensation$1,488 $— $— $1,488 
Our assets and liabilities measured at fair value on a recurring basis at December 31, 2022 were as follows:
  
Fair Value Measurements at
December 31, 2022 Using:
Assets and Liabilities Recorded at
Fair Value on a Recurring Basis
Total
Carrying
Value at
December 31, 2022
Quoted
Prices in
Active
Markets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Assets:
Assets invested for self-insurance
Certificates of deposits, current$3,750 $3,750 $— $— 
Certificates of deposits, noncurrent6,359 6,359 — — 
Available-for-sale debt securities:
United States Government and agency securities25,254 25,254 — — 
Corporate notes and bonds264 264 — — 
Total available-for-sale debt securities25,518 25,518 — — 
Marketable equity securities:
Mutual funds13,873 13,873 — — 
Corporate stocks3,007 3,007 — — 
Exchange traded funds1,230 1,230 — — 
Total marketable equity securities18,110 18,110 — — 
Liabilities:
Deferred compensation$4,597 $— $4,597 $— 
Financial instruments recorded at historical carrying value [Table Text Block] Financial instruments classified as noncurrent assets and liabilities and their carrying values and fair values were as follows:
 September 30, 2023December 31, 2022
Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Assets:
Available-for-sale debt securities$40,610 $40,610 $25,518 $25,518 
Marketable equity securities10,276 10,276 18,110 18,110 
Liabilities:
Revolving credit facility, noncurrent$206,262 $206,262 $150,433 $150,433 
Senior unsecured notes, noncurrent60,000 57,335 75,000 74,968 
Term loans, noncurrent8,409 8,420 5,854 5,610 
Total$274,671 $272,017 $231,287 $231,011