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Financial Instruments
3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Financial Instruments

5.

Financial Instruments

The Corporation’s financial instruments include cash equivalents, accounts receivable, notes receivable, bank overdraft, accounts payable, publicly-registered long-term notes, debentures and other long-term debt.

Cash equivalents are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposits. The Corporation’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.

Accounts receivables are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. However, accounts receivables are more heavily concentrated in certain states (namely, Texas, Colorado, North Carolina, Iowa and Georgia). The estimated fair values of accounts receivables approximate their carrying amounts due to the short-term nature of the receivables.

Notes receivables are primarily promissory notes with customers and are not publicly traded. Management estimates that the fair value of notes receivables approximates the carrying amount. The estimated fair values of notes receivables approximate their carrying amounts due to the short-term nature of the receivables.

The bank overdraft represents amounts to be funded to financial institutions for checks that have cleared the bank. The estimated fair value of the bank overdraft approximates its carrying value. The estimated fair value of the bank overdraft approximates its carrying amount due to the short-term nature of the overdraft.

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

The carrying values and fair values of the Corporation’s long-term debt were $1,581,023,000 and $1,691,478,000, respectively, at March 31, 2015; $1,585,395,000 and $1,680,584,000, respectively, at December 31, 2014; and $1,067,944,000 and $1,127,149,000, respectively, at March 31, 2014. The estimated fair value of the publicly-registered long-term notes was estimated based on Level 1 of the fair value hierarchy using quoted market prices. The fair value of the Notes was based on Level 2 of the fair value hierarchy using quoted market prices for similar debt instruments. The estimated fair value of other borrowings, which primarily represents variable-rate debt, approximates its carrying amount as the interest rates reset periodically.