Quarterly report pursuant to Section 13 or 15(d)

Investments in Affiliates Accounted for Using the Equity Method (Investment in Lending Tree) (Details)

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Investments in Affiliates Accounted for Using the Equity Method (Investment in Lending Tree) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Carrying amount $ 157,484   $ 157,484   $ 167,643
Share of earnings (loss) of affiliates, net $ (9,035) $ 1,921 $ (7,504) $ (2,443)  
LendingTree          
Schedule of Equity Method Investments [Line Items]          
Percentage ownership 26.30%   26.30%    
Market value $ 1,056,926   $ 1,056,926    
Carrying amount 156,627   156,627   166,465
Share of earnings (loss) of affiliates, net (9,100) $ 2,000 (7,300) $ (1,400)  
Other          
Schedule of Equity Method Investments [Line Items]          
Carrying amount $ 857   $ 857   $ 1,178