Insurance and Construction Defect Claim Reserves - Summary of Insurance and Defect Claim Reserves Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Movement in Liability for Future Policy Benefits [Roll Forward]
Balance at beginning of period	$ 61,450	$ 56,219	$ 60,415	$ 55,308
Expense provisions	3,586	2,745	6,504	5,210
Cash payments, net of recoveries	(1,155)	(2,147)	(3,038)	(3,701)
Balance at end of period	$ 63,881	$ 56,817	$ 63,881	$ 56,817