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, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]      
Carrying amount $ 112,975   $ 114,655
Share of earnings (loss) $ (2,492) $ 1,723  
LendingTree      
Schedule of Equity Method Investments [Line Items]      
Percentage ownership 27.00%    
Market value $ 1,057,952    
Carrying amount 112,174   114,655
Share of earnings (loss) (2,500) $ 1,700  
Other      
Schedule of Equity Method Investments [Line Items]      
Carrying amount $ 801   $ 0