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Other Investments (Summarized Investee Financial Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance Sheets      
Total assets $ 3,653,763 $ 2,118,045  
Total liabilities 1,918,034 1,016,502  
Noncontrolling interests 1,486 2,007  
Total equity attributable to parent entities 1,734,243 1,099,536  
Income Statements      
Revenues 214,123 262,970 $ 261,867
Expenses (181,456) (187,257) (167,999)
Net income attributable to parent entities $ 32,474 $ 75,056 $ 91,633