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DEBT
9 Months Ended
Sep. 30, 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 September 30, 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 and October 20, 2016, the Company entered into separate Note Purchase Agreements pursuant to which it issued senior unsecured notes (the "Notes") through a private placement. The 2015 Notes and 2016 Notes each have an aggregate principal amount of $350,000, comprised of four different series ranging from $50,000 to $100,000, with maturity dates ranging from August 20, 2025 through April 1, 2045, and interest rates ranging from 2.75% and 4.02%. Interest on the Notes is paid semi-annually. The Company's total weighted average effective interest rate and weighted average initial tenure of the Notes is 3.3% and 18 years, respectively. The proceeds of the Notes were used for general corporate purposes. The Notes contain certain affirmative and negative covenants. As of September 30, 2018, the Company was in compliance with all of its debt covenants relating to the Notes.