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v3.20.1

Financing (Tables) | 3 Months Ended
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Mar. 31, 2020
Financing |
Outstanding financing facilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2020 |  | December 31, 2019
Revolving Credit Facility, weighted-average variable interest rate of 2.213% | ​ | $ | 344,000 | ​ | $ | 261,000
4.875% Senior Notes due 2021, effective interest rate of 4.948% | ​ |  | 500,000 | ​ |  | 500,000
4.625% Senior Notes due 2021, effective interest rate of 4.644% | ​ |  | 300,000 | ​ |  | 300,000
3.800% Senior Notes due 2022, effective interest rate of 3.845% | ​ |  | 300,000 | ​ |  | 300,000
3.850% Senior Notes due 2023, effective interest rate of 3.851% | ​ |  | 300,000 | ​ |  | 300,000
3.550% Senior Notes due 2026, effective interest rate of 3.570% | ​ |  | 500,000 | ​ |  | 500,000
3.600% Senior Notes due 2027, effective interest rate of 3.619% | ​ |  | 750,000 | ​ |  | 750,000
4.350% Senior Notes due 2028, effective interest rate of 4.383% | ​ |  | 500,000 | ​ |  | 500,000
3.900% Senior Notes due 2029, effective interest rate of 3.901% | ​ | ​ | 500,000 | ​ | ​ | 500,000
4.200% Senior Notes due 2030, effective interest rate of 4.205% | ​ | ​ | 500,000 | ​ | ​ | —
Principal amount of long-term debt | ​ | ​ | 4,494,000 | ​ | ​ | 3,911,000
Less: Unamortized discount and debt issuance costs | ​ | ​ | 22,752 | ​ | ​ | 20,473
Long-term debt | ​ | $ | 4,471,248 | ​ | $ | 3,890,527

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