Financial Instruments	12 Months Ended
Dec. 31, 2023
Financial Instruments Disclosure [Abstract]
Financial Instruments	Note H: Financial Instruments The Company’s financial instruments include temporary cash investments, restricted cash, restricted investments, accounts receivable, notes receivable, accounts payable, publicly-registered long-term notes, debentures and other long-term debt. Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposit accounts with financial institutions. The Company’s cash equivalents have maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value. Restricted cash is held in a trust account with a third-party intermediary. Due to the short-term nature of this account, the carrying value of restricted cash approximates its fair value. Restricted investments at December 31, 2022 were held in a fund that invested solely in U.S. Treasury securities. The estimated fair value of the fund was valued at net asset value, which the fund seeks to maintain at one dollar per share. As such, the carrying value of the restricted investments approximated its fair value. The Company was restricted from accessing the investments, which were used to settle the 0.650% Senior Notes and related interest payments on the maturity date of July 17, 2023. Accounts receivable are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. However, accounts receivable are more heavily concentrated in certain states, namely Texas, North Carolina, Colorado, California, Georgia, Minnesota, Arizona, Iowa, Florida and Indiana. The carrying values of accounts receivable approximate their fair values. The note receivable at December 31, 2022 was a promissory note with an unconsolidated affiliate (see Note N) and was not publicly traded. Management estimated that the carrying value of the note receivable approximated its fair value. This note was repaid in full in 2023. Accounts payable represent amounts owed to suppliers and vendors. The estimated carrying value of accounts payable approximates its fair value due to the short-term nature of the payables. The carrying values and fair values of the Company’s long-term debt were $4.35 billion and $3.88 billion, respectively, at December 31, 2023 and $5.04 billion and $4.36 billion, respectively, at December 31, 2022. The estimated fair value of the Company’s publicly-registered long-term debt was estimated based on Level 1 of the fair value hierarchy using quoted market prices.

Financial Instruments

12 Months Ended

Dec. 31, 2023

Financial Instruments Disclosure [Abstract]

Note H: Financial Instruments

The Company’s financial instruments include temporary cash investments, restricted cash, restricted investments, accounts receivable, notes receivable, accounts payable, publicly-registered long-term notes, debentures and other long-term debt.

Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposit accounts with financial institutions. The Company’s cash equivalents have maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value.

Restricted cash is held in a trust account with a third-party intermediary. Due to the short-term nature of this account, the carrying value of restricted cash approximates its fair value.

Restricted investments at December 31, 2022 were held in a fund that invested solely in U.S. Treasury securities. The estimated fair value of the fund was valued at net asset value, which the fund seeks to maintain at one dollar per share. As such, the carrying value of the restricted investments approximated its fair value. The Company was restricted from accessing the investments, which were used to settle the 0.650% Senior Notes and related interest payments on the maturity date of July 17, 2023.

Accounts receivable are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. However, accounts receivable are more heavily concentrated in certain states, namely Texas, North Carolina, Colorado, California, Georgia, Minnesota, Arizona, Iowa, Florida and Indiana. The carrying values of accounts receivable approximate their fair values.

The note receivable at December 31, 2022 was a promissory note with an unconsolidated affiliate (see Note N) and was not publicly traded. Management estimated that the carrying value of the note receivable approximated its fair value. This note was repaid in full in 2023.

Accounts payable represent amounts owed to suppliers and vendors. The estimated carrying value of accounts payable approximates its fair value due to the short-term nature of the payables.

The carrying values and fair values of the Company’s long-term debt were $4.35 billion and $3.88 billion, respectively, at December 31, 2023 and $5.04 billion and $4.36 billion, respectively, at December 31, 2022. The estimated fair value of the Company’s publicly-registered long-term debt was estimated based on Level 1 of the fair value hierarchy using quoted market prices.