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
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Carrying amount $ 172,975   $ 177,030
Share of earnings (losses) $ (3,296) $ (2,492)  
LendingTree      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership 26.90%    
Market value $ 1,210,769    
Carrying amount 171,116   174,002
Share of earnings (losses) (2,100) $ (2,500)  
Other      
Schedule of Equity Method Investments [Line Items]      
Carrying amount $ 1,859   $ 3,028