Significant Accounting Policies (Narrative) (Details)		12 Months Ended
	Oct. 27, 2014 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)
Accounting Policies [Line Items]
Assets, Fair Value Disclosure		$ 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure			$ 0
Out-of-period equity adjustment		$ 0	1,933,000	$ 0
Direct finance lease, interest rate, minimum		10.00%
Allowance for doubtful accounts		$ 0	0
Growth period		4 years
Asset impairment charges		$ 0	0	0
Land not owned under option agreements		9,293,000	16,214,000
One-time income tax benefit		0	0	(25,244,000)
Deferred tax assets		67,755,000	80,814,000
Deferred income tax assets, net		67,598,000	80,663,000
Valuation allowance for deferred tax assets		(1,147,000)	(1,161,000)	(1,161,000)
Deferred tax asset related to net operating loss carryforwards		40,800,000	55,622,000
Deferred tax asset related to basis in partnership		$ 22,922,000	$ 24,773,000
Percentage of controlling interests in several builders by parent		50.00%
Percentage of noncontrolling interests in several builders by parent		50.00%
Number of reportable segments | segment		2	2
Number of operating segments | segment		3	2
Direct finance lease, interest rate, maximum		12.00%
Overstatement of accrued expenses				1,900,000
Salary expense		$ 21,871,000	$ 16,272,000	11,428,000
Selling, general and administrative expense		16,758,000	13,704,000	9,840,000
Cost of residential units		$ 283,454,000	201,768,000	153,799,000
Minimum
Accounting Policies [Line Items]
Community life cycle		2 years
Home construction period		5 months
Useful lives of assets		3 years
Estimated warranty accrual per home closed		$ 1,200
Maximum
Accounting Policies [Line Items]
Community life cycle		6 years
Home construction period		9 months
Useful lives of assets		10 years
Estimated warranty accrual per home closed		$ 2,000
Selling, General and Administrative Expenses
Accounting Policies [Line Items]
Advertising expense		700,000	500,000	400,000
Other Assets
Accounting Policies [Line Items]
Debt issuance cost		800,000	800,000
Federal
Accounting Policies [Line Items]
Net operating loss carryforward		$ 116,600,000
Operating loss carryforward, expiration date		Dec. 31, 2029
State
Accounting Policies [Line Items]
Net operating loss carryforward		$ 21,300,000
Reverse Recapitalization
Accounting Policies [Line Items]
One-time income tax benefit	$ 26,600,000
Deferred tax assets	63,900,000
Reverse Recapitalization | Federal
Accounting Policies [Line Items]
Net operating loss carryforward	182,300,000
Reverse Recapitalization | State
Accounting Policies [Line Items]
Net operating loss carryforward	$ 21,600,000
Retained Earnings
Accounting Policies [Line Items]
Out-of-period equity adjustment			1,933,000
Mechanic Liens | Other Nonoperating Income/Expense
Accounting Policies [Line Items]
Other nonoperating income		12,500,000	7,700,000	6,900,000
Other nonoperating expense		$ 11,100,000	5,900,000	4,400,000
Change in Classification of Indirect Project Costs
Accounting Policies [Line Items]
Salary expense			(4,400,000)	(3,400,000)
Selling, general and administrative expense			(800,000)	(600,000)
Cost of residential units			$ 5,200,000	$ 4,000,000
Corporate and Other
Accounting Policies [Line Items]
Percentage of total revenue		96.10%	87.30%	81.40%