Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Assets and Liabilities on a Recurring Basis (Details)

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Fair Value - Assets and Liabilities on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Non-qualified benefit plan assets $ 9,937 $ 9,041
Total Assets 9,937 9,041
Liabilities:    
Interest rate swaps 10,170 13,073
Long term debt 224,444 241,278
Total Liabilities $ 234,614 $ 254,351