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Long-Term Debt | 9 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Long-Term Debt | 9. Long-Term Debt Long-term debt consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2020 |  | December 31, 2019
Credit Facility | ​ | $ | 746,000 | ​ | $ | 513,000
​ | ​ | ​ | ​ | ​ | ​ | ​
2028 Notes | ​ |  | 500,000 | ​ |  | 500,000
Less: Deferred financing costs, net of amortization | ​ |  | (7,357) | ​ |  | (8,090)
​ | ​ |  | 492,643 | ​ |  | 491,910
​ | ​ | ​ | ​ | ​ | ​ | ​
2027 Notes | ​ | ​ | 500,000 | ​ |  | 500,000
Less: Deferred financing costs, net of amortization | ​ | ​ | (7,184) | ​ |  | (7,999)
​ | ​ | ​ | 492,816 | ​ |  | 492,001
​ | ​ | ​ | ​ | ​ | ​ | ​
2022 Notes | ​ |  | — | ​ |  | 350,000
Less: Debt discount, net of amortization | ​ |  | — | ​ |  | (2,046)
Less: Deferred financing costs, net of amortization | ​ |  | — | ​ |  | (2,316)
​ | ​ |  | — | ​ |  | 345,638
​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | $ | 1,731,459 | ​ | $ | 1,842,549
​ Credit Facility As of September 30, 2020, there were $12.4 million letters of credit outstanding under the Credit Facility and the applicable margin on borrowings outstanding was 2.5%. The weighted average annual interest rate on the outstanding balance under the Credit Facility, excluding the effect of interest rate swaps, was 2.7% and 4.3% at September 30, 2020 and December 31, 2019, respectively. We incurred $0.4 million in commitment fees on the daily unused amount of the Credit Facility during each of the three months ended September 30, 2020 and 2019, and $1.5 million during each of the nine months ended September 30, 2020 and 2019. We must maintain certain consolidated financial ratios as defined in our Credit Facility agreement. As of September 30, 2020, the ratio requirements did not constrain our undrawn capacity and as such, $491.6 million was available for additional borrowings. As of September 30, 2020, we were in compliance with all covenants under the Credit Facility agreement. 2022 Notes Redemption On April 1, 2020, the 2022 Notes were redeemed at 100% of their $350.0 million aggregate principal amount plus accrued and unpaid interest of $10.5 million with borrowings from the Credit Facility. A debt extinguishment loss of $4.0 million related to the redemption was recognized during the nine months ended September 30, 2020.

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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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