Schedule IV - Mortgage Loans on Real Estate Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance as of the beginning of the year	$ 2,070	$ 2,773	$ 12,737
Collection of mortgage loans	(738)	(703)	(9,964)
Balance as of the end of the year	$ 1,332	$ 2,070	$ 2,773