Financial Instruments	9 Months Ended
Sep. 30, 2023
Financial Instruments Disclosure [Abstract]
Financial Instruments	5. Financial Instruments The Company’s financial instruments include temporary cash investments, restricted cash, restricted investments, accounts receivable, note receivable, accounts payable, publicly-registered long-term notes and debentures. 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 sought 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 2023 Notes and related interest payments. Accounts receivable are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. No single customer accounted for 10% or more of consolidated accounts receivable at September 30, 2023 and December 31, 2022. The carrying values of accounts receivable approximate their fair values. Note receivable is a promissory note with an unconsolidated affiliate (see Note 8) and is not publicly traded. Management estimates that the carrying value of the note receivable approximates its fair value. 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 value and fair value of the Company’s long-term debt were $4.34 billion and $3.56 billion, respectively, at September 30, 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

9 Months Ended

Sep. 30, 2023

Financial Instruments Disclosure [Abstract]

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

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 sought 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 2023 Notes and related interest payments.

Accounts receivable are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. No single customer accounted for 10% or more of consolidated accounts receivable at September 30, 2023 and December 31, 2022. The carrying values of accounts receivable approximate their fair values.

Note receivable is a promissory note with an unconsolidated affiliate (see Note 8) and is not publicly traded. Management estimates that the carrying value of the note receivable approximates its fair value.

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 value and fair value of the Company’s long-term debt were $4.34 billion and $3.56 billion, respectively, at September 30, 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.