XML 111 R82.htm IDEA: XBRL DOCUMENT v3.20.1
Investments In Affiliated Companies, Partnership And Other Companies (Investments In Affiliated Companies) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investments in and Advances to Affiliates [Line Items]    
Document Fiscal Year Focus 2019  
Companies accounted for under the equity method $ 141,594 $ 144,435
Investment Owned, at Fair Value 51,415 46,858
Companies accounted for on a cost basis 8,565 4,887
Investments in affiliated companies 201,574 $ 196,180
Impairment of investments under cost-method 2,700  
Company    
Investments in and Advances to Affiliates [Line Items]    
Companies accounted for on a cost basis $ 5,000