(In thousands)		2011		2010
Industrial revenue bonds, due from 2012 through 2023	$	9,004	$	9,102
Revolving credit agreement, due 2012		-		110,000
5.74% Senior notes due 2013		125,024		125,038
5.51% Senior notes due 2017		150,000		150,000
3.84% Senior notes due 2021		100,000		-
4.24% Senior notes due 2026		200,000		-
Other debt		2,402		2,504
Total debt		586,430		396,644
Less: current portion of long-term debt and short-term debt		2,502		2,602
Total long-term debt	$	583,928	$	394,042

The weighted-average interest rate of the Corporation's Industrial Revenue Bonds was 0.47% and 0.57% in 2011 and 2010, respectively. The weighted-average interest rate of the Corporation's Revolving Credit Agreement was 0.77% and 0.80% in 2011 and 2010, respectively.

The fair value of the Corporation's debt is prepared in accordance with the requirements of U.S. GAAP, as noted in Note 8 of the Consolidated Financial Statements. The estimated fair value amounts were determined by the Corporation using available market information which is primarily based on quoted market prices for the same or similar issues. The carrying amount of the Revolving Credit Agreement and Industrial Revenue Bonds approximates fair value as the interest rates on this variable debt are reset periodically to reflect market conditions and rates. Fair values for the Corporation's fixed rate debt totaled $615 million and $302 million at December 31, 2011 and 2010, respectively. The increase in the fair value primarily relates to our 2011 Notes, discussed further below. These fair values were estimated by management. The fair values described above may not be indicative of net realizable value or reflective of future fair values. Furthermore, the use of different methodologies to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.

(In thousands)
2012	$	2,502
2013		125,130
2014		108
2015		110
2016		92
Thereafter		458,488
Total	$	586,430

Interest payments of $17 million, $21 million, and $24 million were made in 2011, 2010, and 2009, respectively.

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 and funding obligations under the defined pension plan, 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 August 10, 2007, the Corporation and certain of its subsidiaries amended and refinanced its existing credit facility and entered into a Second Amended and Restated Credit Agreement (“Credit Agreement”). 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. The Corporation's available credit under the credit facility is $425 million from a syndicate of banks, led by Bank of America, N.A. and JP Morgan Chase Bank, N.A. as the co-arrangement banks. The Credit Agreement also contains an accordion feature, which can expand the overall credit line to a maximum aggregate amount of $600 million. The consortium membership has remained relatively the same. The Credit Agreement extended the maturity to August 10, 2012, at which time all amounts then outstanding under the Credit Agreement will be due and payable. In addition, the Credit Agreement provides for improved pricing and more favorable covenant terms, reduced facility fees, and increased availability of the facility for letters of credit. Borrowings under the Credit Agreement bear interest at a floating rate based on market conditions. In addition, the interest rate and level of facility fees are dependent on certain financial ratio levels, as defined in the Credit Agreement. The Corporation is subject to annual facility fees on the commitments under the Credit Agreement. In connection with the Credit Agreement, the Corporation paid customary transaction fees that have been deferred and are being amortized over the term of the Credit Agreement. The Corporation is required under the Credit Agreement to maintain certain financial ratios and meet certain financial tests and minimum funding level for the defined benefit plan, the most restrictive of which is a debt to capitalization limit of 60% and a cross default provision with other senior indebtedness. As of December 31, 2011, the Corporation had the flexibility to issue additional debt of approximately $1.2 billion without exceeding the covenant limit defined in the Credit Agreement. The Corporation would consider other financing alternatives to maintain capital structure balance and ensure compliance with all debt covenants. The Corporation had $0 million and $110 million in borrowings outstanding (excluding letters of credit) under the Credit Agreement at December 31, 2011 and 2010, respectively. The unused credit available under the Credit Agreement at December 31, 2011 and 2010 was $373 million and $258 million, respectively.

On December 1, 2005, the Corporation issued $150.0 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 will be 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% and 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 mature on September 25, 2013. The $75 million 5.13% Senior Notes were repaid during the third quarter of 2010 by drawing down on our revolver. The 2003 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 2003 Notes, subject to a make-whole amount in accordance with the Note Purchase Agreement. The Corporation paid customary fees that have been deferred and will be amortized over the terms of the 2003 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% and a cross default provision with the Corporation's other senior indebtedness.