4.	Long-Term Debt

`	March 31,			December 31,			March 31,
	2015			2014			2014
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	299,182		$	299,123		$	298,949
7% Debentures, due 2025		124,508			124,500			124,478
6.25% Senior Notes, due 2037		228,194			228,184			228,157
4.25% Senior Notes, due 2024		395,410			395,309			—
Floating Rate Notes, due 2017, interest rate of 1.36% and 1.33% at March 31, 2015 and December 31, 2014, respectively		298,980			298,869			—
Term Loan Facility, due 2018, interest rate of 1.67% at March 31, 2015 and December 31, 2014; and 1.65% at March 31, 2014		233,213			236,258			245,395
Revolving Facility, interest rate of 1.89% at March 31, 2014		—			—			20,000
Trade Receivable Facility, interest rate of 0.75% at March 31, 2014		—			—			150,000
Other notes		1,536			3,152			965
Total debt		1,581,023			1,585,395			1,067,944
Less: Current maturities		(14,406	)		(14,336	)		(12,403	)
Long-term debt	$	1,566,617		$	1,571,059		$	1,055,541

4.	Long-Term Debt (continued)

The Corporation, through a wholly-owned special purpose subsidiary, has a $250,000,000 trade receivable securitization facility (the “Trade Receivable Facility”), which matures on September 30, 2016. The Trade Receivable Facility, with SunTrust Bank, Regions Bank, PNC Bank, National Association and certain other lenders that may become a party to the facility from time to time, is backed by eligible trade receivables, as defined, of $339,086,000, $369,575,000 and $232,566,000 at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. These receivables are originated by the Corporation and then sold to the wholly-owned special purpose subsidiary by the Corporation. The Corporation continues to be responsible for the servicing and administration of the receivables purchased by the wholly-owned special purpose subsidiary. Borrowings under the Trade Receivable Facility bear interest at a rate equal to one-month LIBOR plus 0.7% and are limited to the lesser of the facility limit or the borrowing base, as defined, of $280,101,000, $313,428,000 and $177,233,000 at March 31, 2015, December 31, 2014 and March 31, 2014, respectively. The Trade Receivable Facility contains a cross-default provision to the Corporation’s other debt agreements.

The Corporation’s Credit Agreement, which provides a $250,000,000 senior unsecured term loan (the “Term Loan Facility”) and a $350,000,000 five-year senior unsecured revolving facility (the “Revolving Facility”), requires the Corporation’s ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (“EBITDA”), as defined by the Credit Agreement, for the trailing twelve months (the “Ratio”) to not exceed 3.50x as of the end of any fiscal quarter, provided that the Corporation may exclude from the Ratio debt incurred in connection with certain acquisitions for a period of 180 days so long as the Corporation, as a consequence of such specified acquisition, does not have its rating on long-term unsecured debt fall below BBB by Standard & Poor’s or Baa2 by Moody’s and the Ratio calculated without such exclusion does not exceed 3.75x. Additionally, if no amounts are outstanding under both the Revolving Facility and the Trade Receivable Facility, consolidated debt, including debt for which the Corporation is a co-borrower, may be reduced by the Corporation’s unrestricted cash and cash equivalents in excess of $50,000,000, such reduction not to exceed $200,000,000, for purposes of the covenant calculation.

In 2014, the Corporation amended the Credit Agreement to ensure the impact of the business combination with TXI does not impair liquidity available under the Term Loan Facility and the Revolving Facility. The amendment adjusts consolidated EBITDA to add back fees, costs or expenses relating to the TXI business combination incurred on or prior to the closing of the combination not to exceed $95,000,000; any integration or similar costs or expenses related to the TXI business combination incurred in any period prior to the second anniversary of the closing of the TXI business combination not to exceed $70,000,000; and any make-whole fees incurred in connection with the redemption of TXI’s 9.25% senior notes due 2020. The Corporation was in compliance with this Ratio at March 31, 2015.

Available borrowings under the Revolving Facility are reduced by any outstanding letters of credit issued by the Corporation under the Revolving Facility. At March 31, 2015, December 31, 2014 and March 31, 2014, the Corporation had $2,507,000 of outstanding letters of credit issued under the Revolving Facility.

4.Long-Term Debt (continued)

Accumulated other comprehensive loss includes the unamortized value of terminated forward starting interest rate swap agreements. For the three months ended March 31, 2015, the Corporation recognized $307,000 as additional interest expense. For the three months ended March 31, 2014, the Corporation recognized $288,000 as additional interest expense. The ongoing amortization of the terminated value of the forward starting interest rate swap agreements will increase annual interest expense by approximately $1,200,000 until the maturity of the 6.6% Senior Notes in 2018.