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Investment Partnerships and Other Entities, Equity Method Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Investments In Affiliated and Unaffiliated Entities [Abstract]                  
Investments in unaffiliated entities $ 24,900 $ 20,500              
Investments in affiliated entities 99,100 124,800              
Summarized Financial Information [Abstract]                  
Total assets 1,174,545 1,010,906              
Total liabilities 66,328 63,086              
Total equity 901,389 897,435 $ 854,167 $ 852,687 $ 820,803 $ 888,797 $ 884,188 $ 889,004 $ 866,248
Net income/(loss) 18,816 39,188              
Equity Method Investment [Member]                  
Summarized Financial Information [Abstract]                  
Total assets 1,653,000 1,607,000              
Total liabilities 326,000 246,000              
Total equity 1,327,000 1,361,000              
Net income/(loss) $ 64,000 $ 43,000              
Unaffiliated [Member] | Minimum [Member]                  
Summarized Financial Information [Abstract]                  
Notice period for redeeming investments 30 days                
Unaffiliated [Member] | Maximum [Member]                  
Summarized Financial Information [Abstract]                  
Notice period for redeeming investments 95 days