Long-term debt (Tables)

6 Months Ended

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