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Long-Term Debt | 3 Months Ended
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Mar. 31, 2020
Debt Disclosure [Abstract] |
Long-Term Debt | 10. Long-Term Debt Long-term debt consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2020 |  | December 31, 2019
Credit Facility | ​ | $ | 481,000 | ​ | $ | 513,000
​ | ​ | ​ | ​ | ​ | ​ | ​
2028 Notes | ​ |  | 500,000 | ​ |  | 500,000
Less: Deferred financing costs, net of amortization | ​ |  | (7,851) | ​ |  | (8,090)
​ | ​ |  | 492,149 | ​ |  | 491,910
​ | ​ | ​ | ​ | ​ | ​ | ​
2027 Notes | ​ | ​ | 500,000 | ​ |  | 500,000
Less: Deferred financing costs, net of amortization | ​ | ​ | (7,723) | ​ |  | (7,999)
​ | ​ | ​ | 492,277 | ​ |  | 492,001
​ | ​ | ​ | ​ | ​ | ​ | ​
2022 Notes | ​ |  | 350,000 | ​ |  | 350,000
Less: Debt discount, net of amortization | ​ |  | (1,860) | ​ |  | (2,046)
Less: Deferred financing costs, net of amortization | ​ |  | (2,111) | ​ |  | (2,316)
​ | ​ |  | 346,029 | ​ |  | 345,638
​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term debt | ​ | $ | 1,811,455 | ​ | $ | 1,842,549
​ Credit Facility As of March 31, 2020, there were $13.7 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 3.4% and 4.3% at March 31, 2020 and December 31, 2019, respectively. We incurred $0.7 million and $0.5 million in commitment fees on the daily unused amount of the Credit Facility during the three months ended March 31, 2020 and 2019, respectively. We must maintain certain consolidated financial ratios as defined in our Credit Facility agreement. As a result of these ratio requirements, $651.4 million of the $755.3 million of undrawn capacity was available for additional borrowings as of March 31, 2020. As of March 31, 2020, we were in compliance with all covenants under the Credit Facility agreement.

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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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