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Long-Term Debt | 3 Months Ended
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Mar. 31, 2021
Debt Disclosure [Abstract] |
Long-Term Debt | 9. Long-Term Debt ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | March 31, 2021 |  | December 31, 2020
Credit Facility | ​ | $ | 323,500 | ​ | $ | 393,000
​ | ​ | ​ | ​ | ​ | ​ | ​
2028 Notes | ​ | ​ | ​ | ​ | ​ | ​
Principal | ​ |  | 800,000 | ​ |  | 800,000
Debt premium, net of amortization | ​ | ​ | 14,040 | ​ |  | 14,541
Deferred financing costs, net of amortization | ​ |  | (11,669) | ​ |  | (11,766)
​ | ​ |  | 802,371 | ​ |  | 802,775
​ | ​ | ​ | ​ | ​ | ​ | ​
2027 Notes | ​ | ​ | ​ | ​ | ​ | ​
Principal | ​ | ​ | 500,000 | ​ |  | 500,000
Deferred financing costs, net of amortization | ​ | ​ | (6,633) | ​ |  | (6,908)
​ | ​ | ​ | 493,367 | ​ |  | 493,092
​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | $ | 1,619,238 | ​ | $ | 1,688,867
​ Credit Facility As of March 31, 2021, there were $12.4 million letters of credit outstanding under the Credit Facility and the applicable margin on borrowings outstanding was 2.4%. The weighted average annual interest rate on the outstanding balance under the Credit Facility, excluding the effect of interest rate swaps, was 2.6% and 2.7% at March 31, 2021 and December 31, 2020, respectively. We incurred $0.6 million and $0.7 million in commitment fees on the daily unused amount of the Credit Facility during the three months ended March 31, 2021 and 2020, respectively. We must maintain certain consolidated financial ratios as defined in our Credit Facility agreement (see below). As of March 31, 2021, the ratio requirements did not constrain our undrawn capacity and as such, $414.1 million was available for additional borrowings. As of March 31, 2021, we were in compliance with all covenants under the Credit Facility agreement. ​ Amendment No. 3 On February 22, 2021, we amended our Credit Facility to, among other things:
| ● | reduce the aggregate revolving commitment from $1.25 billion to $750.0 million, and
| ● | adjust the maximum Senior Secured Debt to EBITDA and Total Debt to EBITDA ratios, as defined in the Credit Facility agreement, to the following:
​
​ | ​ | ​
Senior Secured Debt to EBITDA |  | 3.00 to 1.0
Total Debt to EBITDA |  |
Through fiscal year 2022 | ​ | 5.75 to 1.0
January 1, 2023 through September 30, 2023 |  | 5.50 to 1.0
Thereafter (1) |  | 5.25 to 1.0
(1) | Subject to a temporary increase to 5.50 to 1.0 for any quarter during which an acquisition satisfying certain thresholds is completed and for the two quarters immediately following such quarter.
We incurred $1.8 million in transaction costs related to Amendment No. 3, which were included in other assets in our condensed consolidated balance sheets and are being amortized over the remaining term of the Credit Facility. In addition, we wrote off $4.9 million of unamortized deferred financing costs as a result of the amendment, which was recorded to interest expense in our condensed consolidated statements of operations.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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