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Long-term debt | 6 Months Ended
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Jun. 30, 2022
Debt Disclosure [Abstract] |
Long-term debt | Long-term debt Our long-term debt is summarized below (in thousands):
| June 30, 2022 |  | Dec. 31, 2021
Borrowings under revolving credit agreement expiring August 2024 | $ | — |  |  | $ | 166,000 |
Unsecured notes bearing fixed rate interest at 4.75% 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 | 3,090,000 |  |  | 3,256,000 |
Debt issuance costs | (29,194) |  |  | (31,378) |
Unamortized premiums | 6,802 |  |  | 7,348 |
Total long-term debt | $ | 3,067,608 |  |  | $ | 3,231,970 |
As of June 30, 2022, cash and cash equivalents totaled $200.8 million and we had unused borrowing capacity of $1.49 billion under our $1.51 billion revolving credit facility, which expires in August 2024. We were in compliance with all covenants, including the leverage ratio (our one financial covenant) contained in our debt agreements and revolving credit facility. We believe, based on our current financial forecasts and trends, that we will remain compliant with all covenants for the foreseeable future.

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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 https://asc.fasb.org/topic&trid=2208564 + Details
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