Debt - Warehouse Borrowings (Details) - USD ($) $ in Thousands	1 Months Ended
	May 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Warehouse Borrowings
Maximum Borrowing Capacity		$ 1,700,000
Balance Outstanding		501,086	$ 701,563
Repurchase agreement 1
Warehouse Borrowings
Maximum Borrowing Capacity		75,000
Balance Outstanding		18,979	25,953
Repurchase agreement 2
Warehouse Borrowings
Maximum Borrowing Capacity		100,000
Balance Outstanding		87,408	72,971
Extended term	60 days
Repurchase agreement 3
Warehouse Borrowings
Maximum Borrowing Capacity		425,000
Balance Outstanding		68,997	250,722
Repurchase agreement 4
Warehouse Borrowings
Maximum Borrowing Capacity		200,000
Balance Outstanding		142,423	119,838
Repurchase agreement 5
Warehouse Borrowings
Maximum Borrowing Capacity		300,000
Balance Outstanding		103,447	72,666
Extended term	30 days
Repurchase agreement 6
Warehouse Borrowings
Maximum Borrowing Capacity		600,000
Balance Outstanding		$ 79,832	$ 159,413