Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Outstanding Long-Term Debt

Our outstanding long-term debt is shown below: 

	June 30,		December 31,
(in thousands)	2021		2020
Uncollateralized senior notes:
5.93% note, due October 31, 2023	$	7,500	$	9,000
5.68% note, due June 30, 2026	14,500		17,400
6.43% note, due May 2, 2028	4,900		5,600
3.73% note, due December 16, 2028	16,000		16,000
3.88% note, due May 15, 2029	40,000		45,000
3.25% note, due April 30, 2032	70,000		70,000
3.48% note, due May 31, 2038	50,000		50,000
3.58% note, due November 30, 2038	50,000		50,000
3.98% note, due August 20, 2039	100,000		100,000
2.98% note, due December 20, 2034	70,000		70,000
3.00% note, due July 15, 2035	50,000		50,000
2.96% note, due August 15, 2035	40,000		40,000
Less: debt issuance costs	(850)		(901)
Total long-term debt	512,050		522,099
Less: current maturities	(13,600)		(13,600)
Total long-term debt, net of current maturities	$	498,450	$	508,499

    

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Schedule of Line of Credit Facilities [Line Items]

Schedule of Line of Credit Facilities [Table Text Block]

(in thousands)	Total Borrowing Capacity		Less: Amount of Debt Issued		Less: Unfunded Commitments		Remaining Borrowing Capacity
Shelf Agreement
Prudential Shelf Agreement (1)	$	370,000	$	(220,000)	$	—	$	150,000
MetLife Shelf Agreement (1)	150,000		—		—		150,000
NYL Shelf Agreement (1)	150,000		(140,000)		—		10,000
Total Shelf Agreements as of June 30, 2021	$	670,000	$	(360,000)	$	—	$	310,000