Fair Value Measurements and Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair value, assets measured on recurring basis [Table Text Block]

Our assets and liabilities measured at fair value on a recurring basis at December 31, 2023 and December 31, 2022, were as follows:

			Fair Value Measurements at December 31, 2023 Using:
	Total Carrying Value at		Quoted prices in active markets		Significant other observable inputs		Significant unobservable inputs
Description	December 31, 2023		(Level 1)		(Level 2)		(Level 3)
Assets:
Assets invested for self-insurance
Certificates of deposits, current	$	2,859	$	2,859	$	—	$	—
Certificates of deposits, noncurrent	3,500		3,500		—		—
Available-for-sale debt securities:
United States Government and agency securities	36,802		36,802		—		—
Corporate notes and bonds	260		260		—		—
Total available-for-sale debt securities	37,062		37,062		—		—
Marketable equity securities:
Mutual funds	6,842		6,842		—		—
Corporate stocks	3,780		3,780		—		—
Exchange traded funds	1,480		1,480		—		—
Total marketable equity securities	12,102		12,102		—		—
Liabilities:
Deferred compensation	$	1,572	$	—	$	—	$	1,572

			Fair Value Measurements at December 31, 2022 Using:
	Total Carrying Value at		Quoted prices in active markets		Significant other observable inputs		Significant unobservable inputs
Description	December 31, 2022		(Level 1)		(Level 2)		(Level 3)
Assets:
Assets invested for self-insurance
Certificates of deposits, current	$	3,750	$	3,750	$	—	$	—
Certificates of deposits, noncurrent	6,359		6,359		—		—
Available-for-sale debt securities:
United States Government and agency securities	25,254		25,254		—		—
Corporate notes and bonds	264		264		—		—
Total available-for-sale debt securities	25,518		25,518		—		—
Marketable equity securities:
Mutual funds	13,873		13,873		—		—
Corporate stocks	3,007		3,007		—		—
Exchange traded funds	1,230		1,230		—		—
Total marketable equity securities	18,110		18,110		—		—
Liabilities:
Deferred compensation	$	4,597	$	—	$	4,597	$	—

Fair value, by balance sheet grouping [Table Text Block]

Financial instruments classified as noncurrent assets and liabilities and their carrying values and fair values were as follows:

	December 31, 2023				December 31, 2022
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Available-for-sale debt securities	$	37,062	$	37,062	$	25,518	$	25,518
Marketable equity securities	12,102		12,102		18,110		18,110
Liabilities:
Revolving credit facility, noncurrent	141,616		141,616		150,433		150,433
Senior unsecured notes	135,000		130,959		75,000		74,968
Term loans, noncurrent	7,012		7,252		5,854		5,610
Total	$	283,628	$	279,827	$	231,287	$	231,011