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Long-term debt
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Long-term debt Long-term debt
Our long-term debt is summarized below (in thousands):
Mar. 31, 2022Dec. 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 debt3,090,000 3,256,000 
Debt issuance costs(30,295)(31,378)
Unamortized premiums7,078 7,348 
Total long-term debt$3,066,783 $3,231,970 
As of March 31, 2022, cash and cash equivalents totaled $43.3 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.