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DEBT | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
DEBT | DEBT Revolving Credit Agreement The Company has a line of credit totaling $400,000 through the Amended and Restated Credit Agreement (the “Credit Agreement”). The Credit Agreement has a five-year term and may be increased, subject to certain conditions, by an additional amount up to $100,000. The interest rate on borrowings is based on either the London Inter-Bank Offered Rate ("LIBOR") or the prime rate, plus a spread based on the Company’s leverage ratio, at the Company’s election. The Company amended and restated the Credit Agreement on June 30, 2017, extending the maturity of the line of credit to June 30, 2022. The Credit Agreement contains customary affirmative, negative and financial covenants for credit facilities of this type, including limitations on the Company and its subsidiaries with respect to liens, investments, distributions, mergers and acquisitions, dispositions of assets, transactions with affiliates and a fixed charges coverage ratio and total leverage ratio. As of March 31, 2018, the Company was in compliance with all of its covenants and had no outstanding borrowings under the Credit Agreement. Senior Unsecured Notes On April 1, 2015, the Company entered into a Note Purchase Agreement pursuant to which it issued senior unsecured notes (the "2015 Notes") in the aggregate principal amount of $350,000 through a private placement. The proceeds were used for general corporate purposes. The 2015 Notes, as shown in the table below, have original maturities ranging from 10 to 30 years with a weighted average effective interest rate of 3.5%, excluding accretion of original issuance costs, and an initial average tenure of 19 years. Interest is payable semi-annually. The 2015 Notes contain certain affirmative and negative covenants. As of March 31, 2018, the Company was in compliance with all of its debt covenants relating to the 2015 Notes. The maturity and interest rates of the 2015 Notes are as follows:
| Amount |  | Maturity Date |  | Interest Rate
Series A | $ | 100,000 |  |  | August 20, 2025 |  | 3.15 | %
Series B | 100,000 |  |  | August 20, 2030 |  | 3.35 | %
Series C | 50,000 |  |  | April 1, 2035 |  | 3.61 | %
Series D | 100,000 |  |  | April 1, 2045 |  | 4.02 | %
On October 20, 2016, the Company entered into a Note Purchase Agreement pursuant to which it issued senior unsecured notes (the "2016 Notes") in the aggregate principal amount of $350,000 through a private placement. The proceeds are being used for general corporate purposes. The 2016 Notes, as shown in the table below, have original maturities ranging from 12 to 25 years with a weighted average effective interest rate of 3.1%, excluding accretion of original issuance costs, and an initial average tenure of 18 years. Interest is payable semi-annually. The 2016 Notes contain certain affirmative and negative covenants. As of March 31, 2018, the Company was in compliance with all of its debt covenants relating to the 2016 Notes. The maturity and interest rates of the 2016 Notes are as follows:
| Amount |  | Maturity Date |  | Interest Rate
Series A | $ | 100,000 |  |  | October 20, 2028 |  | 2.75 | %
Series B | 100,000 |  |  | October 20, 2033 |  | 3.03 | %
Series C | 100,000 |  |  | October 20, 2037 |  | 3.27 | %
Series D | 50,000 |  |  | October 20, 2041 |  | 3.52 | %
The Company's total weighted average effective interest rate and weighted average initial tenure, inclusive of the 2015 Notes and 2016 Notes, is 3.3% and 18 years, respectively.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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