REAL ESTATE INVENTORY AND LAND DEPOSITS - Schedule of Development Status of Land Inventory (Details) $ in Thousands	Sep. 30, 2020 USD ($) lot	Dec. 31, 2019 USD ($) lot
Inventory [Line Items]
Owned Lots (in lot) | lot	52,996	42,606
Book Value of Land and Development
Inventory [Line Items]
Raw(1) | $	$ 284,326	$ 477,997
Partially developed | $	1,438,211	914,689
Finished | $	2,322,250	1,559,291
Total | $	$ 4,044,787	$ 2,951,977
Raw
Inventory [Line Items]
Owned Lots (in lot) | lot	10,598	13,804
Partially developed
Inventory [Line Items]
Owned Lots (in lot) | lot	21,177	13,298
Finished
Inventory [Line Items]
Owned Lots (in lot) | lot	21,221	15,504