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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Carrying amount $ 167,121   $ 167,121   $ 167,643
Share of earnings (loss) of affiliates, net $ 2,238 $ (1,068) $ 1,531 $ (4,364)  
LendingTree          
Schedule of Equity Method Investments [Line Items]          
Percentage ownership 26.40%   26.40%    
Market value $ 997,138   $ 997,138    
Carrying amount 166,308   166,308   166,465
Share of earnings (loss) of affiliates, net 2,600 $ (1,300) 1,800 $ (3,400)  
Other          
Schedule of Equity Method Investments [Line Items]          
Carrying amount $ 813   $ 813   $ 1,178