Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Carrying amount $ 167,643 $ 177,030  
Share of earnings (losses) of affiliates $ (2,629) 25,772 $ 7,001
LendingTree      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership 26.50%    
Market value $ 1,045,044    
Carrying amount 166,465 174,002  
Share of earnings (losses) of affiliates (1,600) 21,100 $ 7,000
Other      
Schedule of Equity Method Investments [Line Items]      
Carrying amount $ 1,178 $ 3,028