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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Carrying Amount    
Assets:    
Cash and Cash Equivalents $ 1,272 $ 1,163
Total Assets 1,272 1,163
Liabilities:    
Short-Term Debt 97,857 80,997
Long-Term Debt 764,581 764,519
Total 862,438 845,516
Fair Value    
Assets:    
Cash and Cash Equivalents 1,272 1,163
Total Assets 1,272 1,163
Liabilities:    
Short-Term Debt 97,857 80,997
Long-Term Debt 873,632 858,455
Total $ 971,489 $ 939,452