Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2023

Text Block [Abstract]

Outstanding Long-Term Debt

Our outstanding long-term debt is shown below:

	As of December 31,
(in thousands)	2023		2022
Uncollateralized Senior Notes:
5.93% notes, due October 31, 2023	$	—	$	3,000
5.68% notes, due June 30, 2026	8,700		11,600
6.43% notes, due May 2, 2028	3,500		4,200
3.73% notes, due December 16, 2028	10,000		12,000
3.88% notes, due May 15, 2029	30,000		35,000
3.25% notes, due April 30, 2032	59,500		66,500
3.48% notes, due May 31, 2038	50,000		50,000
3.58% notes, due November 30, 2038	50,000		50,000
3.98% notes, due August 20, 2039	100,000		100,000
2.98% notes, due December 20, 2034	70,000		70,000
3.00% notes, due July 15, 2035	50,000		50,000
2.96% notes, due August 15, 2035	40,000		40,000
2.49% notes, due January 25, 2037	50,000		50,000
2.95% notes, due March 15, 2042	50,000		50,000
5.43% notes, due March 14, 2038	80,000		—
6.39% notes, due December 2026	100,000		—
6.44% notes, due December 2027	100,000		—
6.45% notes, due December 2028	100,000		—
6.62% notes, due December 2030	100,000		—
6.71% notes, due December 2033	100,000		—
6.73% notes, due December 2038	50,000		—
Equipment security note
2.46% note, due September 24, 2031	7,633		8,517
Less: debt issuance costs	(3,753)		(946)
Total long-term debt	1,205,580		599,871
Less: current maturities	(18,505)		(21,483)
Total long-term debt, net of current maturities	$	1,187,075	$	578,388

Line of Credit Facility [Line Items]

Schedule of Line of Credit Facilities [Table Text Block]

The following table summarizes the current available capacity under our Shelf Agreements at December 31, 2023:

(in thousands)	Total Borrowing Capacity		Less Amount of Debt Issued		Less Unfunded Commitments		Remaining Borrowing Capacity
Shelf Agreements (1)
Prudential Shelf Agreement	$	405,000	$	(300,000)	$	—	$	105,000
MetLife Shelf Agreement	200,000		(50,000)		—		150,000
Total	$	605,000	$	(350,000)	$	—	$	255,000