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Schedule I - Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
ASSETS        
Total current assets $ 118,406 $ 106,315    
Other assets 26,142 21,473    
Total assets 1,254,598 1,270,142    
LIABILITIES AND EQUITY        
Total current liabilities 175,299 163,890    
Total liabilities 1,175,465 1,213,584    
Commitments and contingencies (Notes 15 and 16)    
Equity:        
Common units 36,508 53,528    
Accumulated other comprehensive income 16,469 3,030    
Total equity 52,977 56,558 $ 109,668 $ 78,397
Total liabilities and equity 1,254,598 1,270,142    
Parent Company [Member]        
ASSETS        
Total current assets 13,828 115    
Loans to subsidiaries 586,634 624,326    
Investment in subsidiaries 71,947 73,640    
Other assets 3,401 2,916    
Total assets 675,810 700,997    
LIABILITIES AND EQUITY        
Total current liabilities 1,341 422    
Accounts payable to subsidiaries 17,658 16,908    
Long-term debt 603,834 627,109    
Total liabilities 622,833 644,439    
Commitments and contingencies (Notes 15 and 16)    
Equity:        
Common units 36,508 53,528    
Accumulated other comprehensive income 16,469 3,030    
Total equity 52,977 56,558    
Total liabilities and equity $ 675,810 $ 700,997