Summary of Significant Accounting Policies - Income Taxes (Details) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended			36 Months Ended
	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) period	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) period	Dec. 31, 2015 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)
Income Taxes
Income tax benefit	$ 110,065			$ 0	$ 109,997	$ 0
Decrease in deferred tax asset valuation allowance	112,900				112,900
Reversal of Valuation Allowance
Net deferred tax assets	121,200		$ 124,500		121,200		$ 121,200	$ 124,500		$ 124,500
Valuation allowance for deferred tax assets	11,000		$ 124,500		$ 11,000		11,000	124,500		$ 124,500
Reversal of valuation allowance included in income tax benefit	2,700
Cumulative profit, period for sustained growth			3 years		3 years
Nominal cumulative profit	20,100				$ 20,100		$ 20,100
Number of quarters in which pre-tax income achieved | period					6
Total quarters in look-back period | period					8
Number of consecutive quarters in which pre-tax income was achieved | period							4
Pre-tax income	7,296	$ 900		(4,466)	$ 8,155	(9,474)	$ 30,000
Homebuilding revenues	$ 184,605			$ 75,902	$ 305,838	129,251		$ 499,000	$ 115,000
Selling, general and administrative expense (“SG&A”) margin (percent)					15.10%			16.00%	30.90%
Taxes paid					$ 600	$ 0
Minimum
Reversal of Valuation Allowance
Gross margins (percent)										18.00%
Maximum
Reversal of Valuation Allowance
Gross margins (percent)										20.00%