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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - CONDENSED BALANCE SHEETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CURRENT ASSETS:      
Cash and cash equivalents $ 55,574 $ 36,482  
Total current assets 245,774 319,585  
OTHER ASSETS:      
Total other assets 119,997 258,123  
TOTAL ASSETS 2,166,016 2,586,694 $ 2,394,748
CURRENT LIABILITIES:      
Accrued taxes other than income taxes 25,054 15,768  
Total current liabilities 214,605 195,586  
Total liabilities 1,093,749 1,321,270  
PARTNERS' CAPITAL:      
Limited Partners - Common Unitholders 127,195,219 and 126,915,597 units outstanding, respectively 1,148,565 1,331,482  
TOTAL LIABILITIES AND PARTNERS' CAPITAL 2,166,016 2,586,694  
Parent Company      
CURRENT ASSETS:      
Cash and cash equivalents 2,174 2,176  
Total current assets 2,174 2,176  
OTHER ASSETS:      
Investments in consolidated subsidiaries 1,146,491 1,329,406  
Total other assets 1,146,491 1,329,406  
TOTAL ASSETS 1,148,665 1,331,582  
CURRENT LIABILITIES:      
Accrued taxes other than income taxes 100 100  
Total current liabilities 100 100  
Total liabilities 100 100  
PARTNERS' CAPITAL:      
Limited Partners - Common Unitholders 127,195,219 and 126,915,597 units outstanding, respectively 1,148,565 1,331,482  
TOTAL LIABILITIES AND PARTNERS' CAPITAL $ 1,148,665 $ 1,331,582