Mortgage notes receivable - Information pertaining to mortgage notes receivable (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended			10 Months Ended	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	[1]	Nov. 14, 2019	Dec. 31, 2018
Mortgage notes receivable
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor	Predecessor		Predecessor	Predecessor
Total loan commitments	$ 1,101,275	$ 1,099,458
Construction holdbacks	253,708	272,274
Interest reserves	18,601	21,703
Total principal outstanding for mortgage notes, receivable	828,966	805,481
Allowance for loan losses	4,096	7,182
Deferred fees	3,281	6,847
Private REIT participation		8,700
Mortgage notes receivable, net	$ 821,589	782,752
Sale Of Mortgage Notes Receivable, Construction Holdbacks		4,500
Sale Of Mortgage Notes Receivable, Interest Reserves		$ 700

[1] Predecessor periods are combined as disclosed in Note 1.