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Long-term debt (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Schedule of Long-Term Debt | Our long-term debt is summarized below (in thousands):
| June 30, 2021 |  | Dec. 31, 2020
Borrowings under revolving credit agreement expiring August 2024 | $ | 256,000 |  |  | $ | 355,000 |
Unsecured notes bearing fixed rate interest at 5.500% due September 2024 | 137,000 |  |  | 137,000 |
Unsecured notes bearing fixed rate interest at 4.750% due March 2026 | 550,000 |  |  | 550,000 |
Unsecured notes bearing fixed rate interest at 7.75% due June 2027 | 200,000 |  |  | 200,000 |
Unsecured notes bearing fixed rate interest at 7.25% due September 2027 | 240,000 |  |  | 240,000 |
Unsecured notes bearing fixed rate interest at 4.625% due March 2028 | 1,000,000 |  |  | 1,000,000 |
Unsecured notes bearing fixed rate interest at 5.00% due September 2029 | 1,100,000 |  |  | 1,100,000 |
Total principal long-term debt | 3,483,000 |  |  | 3,582,000 |
Debt issuance costs | (34,399) |  |  | (36,595) |
Unamortized premiums and discounts, net | 7,377 |  |  | 7,815 |
Total long-term debt | $ | 3,455,978 |  |  | $ | 3,553,220 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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