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Schedule I - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating expenses:      
General and administrative expenses $ 30,930 $ 20,991 $ 16,849
Interest expense 18,244 16,587 27,000
Net income 21,654 107,456 18,076
Other comprehensive income (loss) 5,486 (2,456)  
Comprehensive income (loss) 27,140 105,000  
Parent Company [Member]      
Condensed Income Statements Captions [Line Items]      
Interest income from subsidiaries 13,818 14,684 25,058
Operating expenses:      
General and administrative expenses 236 153 255
Interest expense 13,818 14,684 25,058
Loss before equity in net income of subsidiaries (236) (153) (255)
Equity in net income of subsidiaries 21,890 107,609 18,331
Net income 21,654 107,456 18,076
Other comprehensive income (loss) 5,486 (2,456)  
Comprehensive income (loss) $ 27,140 $ 105,000 $ 18,076