13. DEBT

Debt consists of the following as of December 31:



(In thousands)	2013		2013		2012		2012
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Industrial revenue bond, due 2023	$	8,400	$	8,400	$	8,400	$	8,400
Revolving credit agreement, due 2017	50,000		50,000		286,800		286,800
5.74% Senior notes due 2013	—		—		125,011		128,198
5.51% Senior notes due 2017	150,000		163,059		150,000		168,491
3.84% Senior notes due 2021	98,632		98,632		100,677		100,677
3.70% Senior notes due 2023	225,000		209,140		—		—
3.85% Senior notes due 2025	88,555		88,555		—		—
4.24% Senior notes due 2026	173,557		173,557		198,581		198,581
4.05% Senior notes due 2028	64,411		64,411		—		—
4.11% Senior notes due 2028	100,000		89,252		—		—
Other debt	1,383		1,383		10,746		10,746
Total debt	959,938		946,389		880,215		901,893
Less: current portion of long-term debt and short-term debt	1,334		1,334		128,225		128,225
Total long-term debt	$	958,604	$	945,055	$	751,990	$	773,668

The weighted-average interest rate of the Corporation’s Revolving Credit Agreement was 1.7% and 2.0% in 2013 and 2012, respectively.

The debt outstanding had fixed and variable interest rates averaging 3% during the twelve months ended December 31, 2013.

Aggregate maturities of debt are as follows:



(In thousands)
2014	$	1,334
2015	33
2016	16
2017	200,000
2018	—
Thereafter	758,555
Total	$	959,938

Interest payments of $31 million, $24 million, and $17 million were made in 2013, 2012, and 2011, respectively.

On February 26, 2013, the Corporation issued $400 million of Senior Notes (the "2013 Notes"). The 2013 Notes consist of $225 million of 3.70% Senior Notes that mature on February 26, 2023, $100 million of 3.85% Senior Notes that mature on February 26, 2025, and $75 million of 4.05% Senior Notes that mature on February 26, 2028. An additional $100 million of 4.11% Senior Notes were issued on September 26, 2013 that mature on September 26, 2028. The 2013 Notes are senior unsecured obligations, equal in right of payment to the Corporation's existing senior indebtedness. The Corporation, at its option, can prepay at any time all or any part of the 2013 Notes, subject to a make-whole payment in accordance with the terms of the Note Purchase Agreement. In connection with the issuance of the 2013 Notes, the Corporation paid customary fees that have been deferred and are being amortized over the term of the 2013 Notes. Under the terms of the Note Purchase Agreement, the Corporation is required to maintain certain financial ratios, the most restrictive of which is a debt to capitalization limit of 60%. The debt to capitalization ratio (as defined per the Notes Purchase Agreement and Credit Agreement) is calculated using the same formula for all of the Corporation's debt agreements and is a measure of the Corporation's indebtedness to capitalization, where capitalization equals debt plus equity. The Corporation had the ability to borrow additional debt of $1.3 billion without violating our debt to capitalization covenant. The 2013 Notes also contain a cross default provision with respect to the Corporation’s other senior indebtedness.

In August 2012, we amended and refinanced our existing credit facility by entering into a Third Amended and Restated Credit Agreement (Credit Agreement) with a syndicate of financial institutions, led by Bank of America N.A., Wells Fargo, N.A, and JP Morgan Chase Bank, N.A. The proceeds available under the Credit Agreement are to be used for working capital, internal growth initiatives, funding of future acquisitions, and general corporate purposes. Under the terms of the Credit Agreement, we have a borrowing capacity of $500 million. In addition, the Credit Agreement provides an accordion feature which allows us to borrow an additional $100 million. As of December 31, 2013, we had $42 million in letters of credit supported by the credit facility and $50 million of borrowings under the credit facility.

The Credit Agreement contains covenants that we consider usual and customary for an agreement of this type for comparable commercial borrowers, including a maximum consolidated debt to capitalization ratio of 60%. The Credit Agreement has customary events of default, such as non-payment of principal when due; nonpayment of interest, fees, or other amounts; cross-payment default and cross-acceleration.

Borrowings under the credit agreement will accrue interest based on (i) Libor or (ii) a base rate of the highest of (a) the federal funds rate plus 0.5%, (b) BofA’s announced prime rate, or (c) the Eurocurrency rate plus 1%, plus a margin. The interest rate and level of facility fees are dependent on certain financial ratios, as defined in the Credit Agreement. The Credit Agreement also provides customary fees, including administrative agent and commitment fees. In connection with the Credit Agreement, we paid customary transaction fees that have been deferred and are being amortized over the term of the Credit Agreement.

On December 8, 2011, the Corporation issued $300 million of Senior Notes (the "2011 Notes"). The 2011 Notes consist of $100 million of 3.84% Senior Notes that mature on December 1, 2021 and $200 million of 4.24% Senior Series Notes that mature on December 1, 2026. The 2011 Notes are senior unsecured obligations, equal in right of payment to our existing senior indebtedness. The Corporation, at its option, can prepay at any time all or any part of our 2011 Notes, subject to a make-whole payment in accordance with the terms of the Note Purchase Agreement. In connection with our 2011 Notes, the Corporation paid customary fees that have been deferred and are being amortized over the term of our 2011 Notes. Under the Note Purchase Agreement, the Corporation is required to maintain certain financial ratios, the most restrictive of which is a debt to capitalization limit of 60%. The 2011 Notes also contain a cross default provision with our other senior indebtedness.

On December 1, 2005, the Corporation issued $150 million of 5.51% Senior Notes (the "2005 Notes"). The 2005 Notes mature on December 1, 2017. The Notes are senior unsecured obligations and are equal in right of payment to the Corporation’s existing senior indebtedness. The Corporation, at its option, can prepay at any time all or any part of the 2005 Notes, subject to a make-whole amount in accordance with the terms of the Note Purchase Agreement. In connection with the Notes, the Corporation paid customary fees that have been deferred and are being amortized over the terms of the Notes. The Corporation is required under the Note Purchase Agreement to maintain certain financial ratios, the most restrictive of which is a debt to capitalization limit of 60%. The 2005 Notes also contain a cross default provision with the Corporation’s other senior indebtedness.

On September 25, 2003, the Corporation issued $200 million of Senior Notes (the "2003 Notes"). The 2003 Notes consist of $75 million of 5.13% Senior Notes that matured on September 25, 2010 and $125 million of 5.74% Senior Notes that matured on September 25, 2013. The $75 million of 5.13% Senior Notes were repaid during the third quarter of 2010 by drawing down on our revolver. The $125 million of 5.74% Senior Notes were repaid during the third quarter of 2013 by using the funds from the 2013 Notes.