5. LONG-TERM DEBT

The components of long-term debt as of the dates indicated below were as follows:


	September 30, 2016				December 31, 2015
	Principal		Unamortized Debt Issuance Debt Cost		Principal		Unamortized Debt Issuance Debt Cost
	(Thousands of dollars)
Senior Notes issued March 17, 2014, interest only payable semi-annually at 5.25%, maturing March 15, 2019	$	500,000	$	3,064	$	500,000	$	3,999
Revolving Credit Facility due October 1, 2017 with a group of commercial banks, interest payable at variable rates		132,400		—		57,500		—

Total long-term debt	$	632,400	$	3,064	$	557,500	$	3,999

In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs, which changes the presentation of debt issuance costs in the financial statements. These costs are now presented as a direct deduction from the debt liability, rather than as an asset. We adopted the new standard effective January 1, 2016. As a result, we reclassified unamortized debt issuances cost in the amount of $3.1 million and $4.0 million as of September 30, 2016 and December 31, 2015, respectively, and reduced the carrying value of long-term debt by the same amounts.

Our 5.25% Senior Notes (the “2019 Notes”) will mature on March 15, 2019, are unconditionally guaranteed on a senior basis by each of PHI’s wholly-owned domestic subsidiaries, and are the general, unsecured obligations of PHI and the guarantors. Interest is payable semi-annually on March 15 and September 15 of each year. PHI has the option to redeem some or all of the 2019 Notes at any time on or after March 15, 2016 at specified redemption prices. The indenture governing the 2019 Notes (the “2019 Indenture”) contains, among other things, certain restrictive covenants, including limitations on incurring indebtedness, creating liens, selling assets and entering into certain transactions with affiliates. The covenants also limit PHI’s ability to, among other things, pay cash dividends on common stock, repurchase or redeem common or preferred equity, prepay subordinated debt and make certain investments. Upon the occurrence of a “Change in Control Repurchase Event” (as defined in the 2019 Indenture), PHI will be required, unless it has previously elected to redeem the 2019 Notes as described above, to make an offer to purchase the 2019 Notes for a cash price equal to 101% of their principal amount.

Revolving Credit Facility–On September 30, 2016, we amended our revolving credit facility to, among other things, (a) extend the maturity date to October 1, 2018, and (b) modify the fixed charge coverage ratio such that it shall only be tested when the total of our Short Term Investments are less than $150.0 million at the end of any fiscal quarter. Under this facility, we can borrow up to $150.0 million at floating interest rates based on either the London Interbank Offered Rate plus 225 basis points or the prime rate (each as defined in our amended and restated revolving credit facility), at our option. Our revolving credit facility includes usual and customary covenants and events of default for credit facilities of its type. Our ability to borrow under the credit facility is conditioned upon our continued compliance with such covenants, including, among others, (i) covenants that restrict our ability to engage in certain asset sales, mergers or other fundamental changes, to incur liens or to engage in certain other transactions or activities and (ii) financial covenants that stipulate that PHI will maintain a consolidated working capital ratio of at least 2 to 1, a funded debt to consolidated net worth ratio not greater than 1.5 to 1, a fixed charge coverage ratio of at least 1.1 to 1 if our short term investments fall below $150.0 million, and consolidated net worth of at least $450.0 million (with all such terms or amounts as defined in or determined under the amended and restated revolving credit facility). As of September 30, 2016, we believe we were in compliance with these covenants.

Cash paid to fund interest expense was $13.9 million for the quarter ended September 30, 2016 and $13.5 million for the quarter ended September 30, 2015. Cash paid to fund interest expense was $28.3 million for the nine months ended September 30, 2016 and $27.2 million for the nine months ended September 30, 2015.

Letter of Credit Facility—We maintain a separate letter of credit facility that had $13.0 million and $15.3 million in letters of credit outstanding at September 30, 2016 and December 31, 2015, respectively. We have letters of credit securing our workers compensation policies and a traditional provider contract.

Other—PHI, Inc. has cash management arrangements with certain of its principal subsidiaries, in which substantial portions of the subsidiaries’ cash is regularly advanced to PHI, Inc. Although PHI, Inc. periodically repays these advances to fund the subsidiaries’ cash requirements throughout the year, at any given point in time PHI, Inc. may owe a substantial sum to its subsidiaries under these advances, which, in accordance with generally accepted accounting principles, are eliminated in consolidation and therefore not recognized on our consolidated balance sheets. For additional information, see Note 13.