Fair Value of Financial Instruments - Fair value, assets and liabilities measured on recurring and nonrecurring basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Front Yard common stock, at fair value	$ 14,198	$ 20,046
Common Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Front Yard common stock, at fair value	14,198	20,046
Common Stock | Fair value measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Front Yard common stock, at fair value	14,198	20,046
Common Stock | Fair value measurements, recurring | Level 1, Quoted prices in active markets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Front Yard common stock, at fair value	14,198	20,046
Common Stock | Fair value measurements, recurring | Level 2, Observable inputs other than Level 1 prices
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Front Yard common stock, at fair value	0	0
Common Stock | Fair value measurements, recurring | Level 3, Unobservable inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Front Yard common stock, at fair value	$ 0	$ 0