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Debt (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Debt
A summary of debt follows (dollars in thousands):
Average Interest Rate
December 31, 2021Maturity20212020
Private placement unsecured fixed-rate notes
Series B5.01%March 202375,000 75,000 
Series D5.35%July 202675,000 75,000 
Unsecured revolving credit facilityN/AMarch 2026— — 
Unsecured revolving credit facility - CNH3.52%N/A39,222 7,668 
Notes payable to banks1.11%20224,267 14,515 
Total debt$193,489 $172,183 
Annual Maturities of Debt
Annual maturities of debt are as follows (in thousands):
20222023202420252026Thereafter
Maturities of debt$118,489 $— $— $— $75,000 $—