Long-Term Debt

Long-term debt consisted of the following:



	As of December 31,
(in thousands)	2018			2017

Variable rate credit facility	$	—		$	—
Senior unsecured notes	400,000			400,000
Term loan B	296,250			299,250
Unsecured subordinated notes	—			2,656
Total outstanding principal	696,250			701,906
Less: Debt issuance costs	(7,486		)	(8,631		)
Less: Current portion	(3,000		)	(5,656		)
Net carrying value of long-term debt	685,764			687,619
Fair value of long-term debt *	$	662,844		$	703,572

* Fair value of the Senior Notes and the term loan B were estimated based on quoted private market transactions and are classified as Level 1 in the fair value hierarchy. The fair value of the unsecured subordinated notes is determined based on a discounted cash flow analysis using current market interest rates of comparable instruments and is classified as Level 2 in the fair value hierarchy.

Senior Unsecured Notes

On April 28, 2017, we issued $400 million of senior unsecured notes (the "Senior Notes"), which bear interest at a rate of 5.125% per annum and mature on May 15, 2025. The proceeds of the Senior Notes were used to repay our old term loan B, for the payment of the related issuance costs and for general corporate purposes. The Senior Notes were priced at 100% of par value and interest is payable semi-annually on May 15 and November 15. Prior to May 15, 2020, we may redeem the Senior Notes, in whole or in part, at any time, or from time to time, at a price equal to 100% of the principal amount of the Senior Notes, plus accrued and unpaid interest, if any, to the date of redemption, plus a “make-whole” premium, as set forth in the Senior Notes indenture. In addition, on or prior to May 15, 2020, we may redeem up to 40% of the Senior Notes, using proceeds of equity offerings. If we sell certain of our assets or have a change of control, the holders of the Senior Notes may require us to repurchase some or all of the notes. The Senior Notes are also guaranteed by us and the majority our subsidiaries. The Senior Notes contain covenants with which we must comply that are typical for borrowing transactions of this nature.

We incurred approximately $7.0 million of deferred financing costs in connection with the issuance of the Senior Notes, which are being amortized over the life of the Senior Notes. Additionally, we wrote off $2.4 million of deferred financing costs associated with our old term loan B to interest expense in the second quarter of 2017.

Term Loan B

On October 2, 2017, we issued a $300 million term loan B which matures in October 2024. We amended term loan B on April 4, 2018, reducing the interest rate by 25 basis points. Following the amendment, interest is payable on the term loan B at a rate based on LIBOR, plus a fixed margin of 2.00%. Interest will reduce to a rate of LIBOR plus a fixed margin of 1.75% if the company's total net leverage, as defined by the amended agreement, is below 2.75. Term loan B requires annual principal payments of $3 million.

Our Financing Agreement also includes a provision that in certain circumstances we must use a portion of excess cash flow to repay debt. Principal payments included in the contractual obligations table reflect only scheduled principal payments and do not reflect any amounts that may be required to be paid under this provision. As of December 31, 2018, we were not required to make any additional principal payments for excess cash flow.

Under a previous financing agreement, we had a $400 million term loan B that matured in November 2020. We repaid the term loan B in 2017 with the proceeds of our Senior Notes.

As of December 31, 2018 and 2017, the interest rate was 4.34% and 3.82%, respectively on the term loan B. The weighted-average interest rate was 4.30% and 3.42% in 2018 and 2017, respectively.

Revolving Credit Facility

On April 28, 2017, we amended and restated our $100 million revolving credit facility ("Revolving Credit Facility"), increasing its capacity to $125 million and extending the maturity to April 2022. Interest is payable on the Revolving Credit Facility at rates based on LIBOR, plus a margin based on our leverage ratio, ranging from 1.75% to 2.50%.

The Revolving Credit Facility includes the maintenance of a net leverage ratio when we have outstanding borrowings on the facility, as well as other restrictions on payments (dividends and share repurchases). Additionally, we can make acquisitions as long as the pro forma net leverage ratio is less than 5.5 to 1.0.

We granted the lenders pledges of our equity interests in our subsidiaries and security interests in substantially all other personal property including cash, accounts receivables and equipment.

Commitment fees of 0.30% to 0.50% per annum, based on our leverage ratio, of the total unused commitment are payable under the Revolving Credit Facility.

Unsecured Subordinated Notes

The unsecured subordinated promissory notes bore interest at a rate of 7.25% per annum, payable quarterly. The last principal payment of $2.7 million was paid in the third quarter of 2018.