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Long-Term Debt
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Long-Term Debt Long-Term Debt
Our outstanding long-term debt is shown below: 
March 31,December 31,
(in thousands)20212020
Uncollateralized senior notes:
5.93% note, due October 31, 2023 $9,000 $9,000 
5.68% note, due June 30, 2026 17,400 17,400 
6.43% note, due May 2, 2028 5,600 5,600 
3.73% note, due December 16, 2028 16,000 16,000 
3.88% note, due May 15, 2029 45,000 45,000 
3.25% note, due April 30, 203270,000 70,000 
3.48% note, due May 31, 203850,000 50,000 
3.58% note, due November 30, 203850,000 50,000 
3.98% note, due August 20, 2039100,000 100,000 
       2.98% note, due December 20, 203470,000 70,000 
3.00% note, due July 15, 203550,000 50,000 
2.96% note, due August 15, 2035 40,000 40,000 
Less: debt issuance costs(875)(901)
Total long-term debt522,125 522,099 
Less: current maturities(13,600)(13,600)
Total long-term debt, net of current maturities$508,525 $508,499 
.
    Shelf Agreements
We have entered into Shelf Agreements with Prudential, MetLife and NYL, whom are under no obligation to purchase any unsecured debt. The following table summarizes our Shelf Agreements at March 31, 2021:
(in thousands)Total Borrowing CapacityLess: Amount of Debt IssuedLess: Unfunded CommitmentsRemaining 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 March 31, 2021$670,000 $(360,000)$— $310,000 
     (1) The Prudential, MetLife and NYL Shelf Agreements expire in April 2023, May 2023 and November 2021, respectively.

The Uncollateralized Senior Notes, Shelf Agreements or Shelf Notes set forth certain business covenants to which we are subject when any note is outstanding, including covenants that limit or restrict our ability, and the ability of our subsidiaries, to incur indebtedness, or place or permit liens and encumbrances on any of our property or the property of our subsidiaries.