Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation allowances
Net deferred tax assets	$ 122,309		$ 121,200		$ 12,862				$ 122,309	$ 121,200	$ 122,309	$ 121,200	$ 12,862
Valuation allowance for deferred tax assets	0				124,525				0		0		124,525
Decrease in deferred tax asset valuation allowance			112,900	$ 600					$ 11,000
Income (loss) before income taxes	$ 17,496	$ 11,935	$ 7,296	$ 859	$ 16,340	$ 5,520	$ (4,466)	$ (5,008)		$ 20,100	37,586	$ 30,000	12,386	$ (1,603)
Homebuilding revenues											764,041		$ 498,915	243,171	$ 115,000
SG &A as a percent of homebuilding revenue			15.10%		16.00%					15.10%		15.10%	16.00%		30.90%
Gross margin percentage					20.00%								20.00%		18.00%
Tax benefits generated from the exercise of share-based compensation											$ 0		$ 0	$ 0
Previously Reported
Valuation allowances
Net deferred tax assets					$ 124,500								$ 124,500