Supplemental Guarantor Information Supplemental Condensed Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 23, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Cash Provided by (Used in) Operating Activities		$ (90,702)	$ (42,416)	$ (32,303)
Purchases of property and equipment		(195)	(439)	(418)
Cash assumed from joint venture at consolidation		995	2,009	0
Contributions and advances to unconsolidated joint ventures		(27,479)	(15,088)	(15,028)
Contributions to Subsidiaries from Corporate		0	0	0
Distributions of Equity from Subsidiaries		0	0	0
Distributions of capital and repayment of advances to unconsolidated joint ventures		15,577	15,307	32,026
Interest collected on advances to unconsolidated joint ventures		552
Net Cash Provided by (Used in) Investing Activities		(10,550)	1,789	16,580
Borrowings from credit facility		88,000	223,050	99,450
Repayments of credit facility		(206,000)	(179,974)	(125,000)
Proceeds from senior notes		324,465	0	0
Borrowings from other notes payable		0	343	3,552
Repayments of other notes payable	$ 4,110	(4,110)	(15,636)	(5,171)
Payment of debt issuance costs		(7,565)	(1,064)	0
Cash distributions to noncontrolling interest in subsidiary		0	(725)	(2,411)
Contributions to subsidiaries from corporate		0	0	0
Distributions to Corporate from Subsidiaries		0	0	0
Minimum tax withholding paid on behalf of employees for stock awards		(590)	(648)	(248)
Excess income tax (provision)/benefit from stock-based compensation		0	(97)	97
Proceeds from exercise of stock options		102	0	17
Net Cash Provided by (Used in) Financing Activities		194,302	25,249	17,539
Net proceeds from issuance of common stock		0	0	47,253
Cash and Cash Equivalents, Period Increase (Decrease)		93,050	(15,378)	1,816
Cash and cash equivalents		123,546	30,496	45,874	$ 44,058
Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities		(41,739)	(11,753)	(10,211)
Purchases of property and equipment		(124)	(246)	(159)
Cash assumed from joint venture at consolidation		995	2,009
Contributions and advances to unconsolidated joint ventures		(27,479)	(15,088)	(13,028)
Contributions to Subsidiaries from Corporate		0	0	0
Distributions of Equity from Subsidiaries		0	725	647
Distributions of capital and repayment of advances to unconsolidated joint ventures		15,577	15,307	32,026
Interest collected on advances to unconsolidated joint ventures		552
Net Cash Provided by (Used in) Investing Activities		(10,479)	2,707	19,486
Borrowings from credit facility		0	0	0
Repayments of credit facility		0	0	0
Proceeds from senior notes		0
Borrowings from other notes payable			0	0
Repayments of other notes payable		(4,110)	(13,135)	0
Payment of debt issuance costs		0	0
Cash distributions to noncontrolling interest in subsidiary			0	0
Contributions to subsidiaries from corporate		275,794	225,169	131,778
Distributions to Corporate from Subsidiaries		(209,536)	(216,286)	(132,167)
Minimum tax withholding paid on behalf of employees for stock awards		0	0	0
Excess income tax (provision)/benefit from stock-based compensation			0	0
Proceeds from exercise of stock options		0		0
Net Cash Provided by (Used in) Financing Activities		62,148	(4,252)	(389)
Net proceeds from issuance of common stock				0
Cash and Cash Equivalents, Period Increase (Decrease)		9,930	(13,298)	8,886
Cash and cash equivalents		23,772	13,842	27,140	18,254
Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities		(81)	3,272	5,282
Purchases of property and equipment		0	0	0
Cash assumed from joint venture at consolidation		0	0
Contributions and advances to unconsolidated joint ventures		0	0	0
Contributions to Subsidiaries from Corporate		0	0	0
Distributions of Equity from Subsidiaries		0	0	0
Distributions of capital and repayment of advances to unconsolidated joint ventures		0	0	0
Interest collected on advances to unconsolidated joint ventures		0
Net Cash Provided by (Used in) Investing Activities		0	0	0
Borrowings from credit facility		0	0	0
Repayments of credit facility		0	0	0
Proceeds from senior notes		0
Borrowings from other notes payable			343	3,552
Repayments of other notes payable		0	(2,501)	(5,171)
Payment of debt issuance costs		0	0
Cash distributions to noncontrolling interest in subsidiary			(725)	(2,411)
Contributions to subsidiaries from corporate		0	0	0
Distributions to Corporate from Subsidiaries		0	(725)	(647)
Minimum tax withholding paid on behalf of employees for stock awards		0	0	0
Excess income tax (provision)/benefit from stock-based compensation			0	0
Proceeds from exercise of stock options		0		0
Net Cash Provided by (Used in) Financing Activities		0	(3,608)	(4,677)
Net proceeds from issuance of common stock				0
Cash and Cash Equivalents, Period Increase (Decrease)		(81)	(336)	605
Cash and cash equivalents		188	269	605	0
Parent Company [Member]
Net Cash Provided by (Used in) Operating Activities		(31,824)	(7,041)	(1,902)
Purchases of property and equipment		(71)	(193)	(259)
Cash assumed from joint venture at consolidation		0	0
Contributions and advances to unconsolidated joint ventures		0	0	0
Contributions to Subsidiaries from Corporate		(275,794)	(225,169)	(131,778)
Distributions of Equity from Subsidiaries		192,478	189,392	104,695
Distributions of capital and repayment of advances to unconsolidated joint ventures		0	0	0
Interest collected on advances to unconsolidated joint ventures		0
Net Cash Provided by (Used in) Investing Activities		(83,387)	(35,970)	(27,342)
Borrowings from credit facility		88,000	223,050	99,450
Repayments of credit facility		(206,000)	(179,974)	(125,000)
Proceeds from senior notes		324,465
Borrowings from other notes payable			0	0
Repayments of other notes payable		0	0	0
Payment of debt issuance costs		(7,565)	(1,064)
Cash distributions to noncontrolling interest in subsidiary			0	0
Contributions to subsidiaries from corporate		0	0	0
Distributions to Corporate from Subsidiaries		0	0	0
Minimum tax withholding paid on behalf of employees for stock awards		(590)	(648)	(248)
Excess income tax (provision)/benefit from stock-based compensation			(97)	97
Proceeds from exercise of stock options		102		17
Net Cash Provided by (Used in) Financing Activities		198,412	41,267	21,569
Net proceeds from issuance of common stock				47,253
Cash and Cash Equivalents, Period Increase (Decrease)		83,201	(1,744)	(7,675)
Cash and cash equivalents		99,586	16,385	18,129	25,804
Consolidation, Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities		(17,058)	(26,894)	(25,472)
Purchases of property and equipment		0	0	0
Cash assumed from joint venture at consolidation		0	0
Contributions and advances to unconsolidated joint ventures		0	0	(2,000)
Contributions to Subsidiaries from Corporate		275,794	225,169	131,778
Distributions of Equity from Subsidiaries		(192,478)	(190,117)	(105,342)
Distributions of capital and repayment of advances to unconsolidated joint ventures		0	0	0
Interest collected on advances to unconsolidated joint ventures		0
Net Cash Provided by (Used in) Investing Activities		83,316	35,052	24,436
Borrowings from credit facility		0	0	0
Repayments of credit facility		0	0	0
Proceeds from senior notes		0
Borrowings from other notes payable			0	0
Repayments of other notes payable		0	0	0
Payment of debt issuance costs		0	0
Cash distributions to noncontrolling interest in subsidiary			0	0
Contributions to subsidiaries from corporate		(275,794)	(225,169)	(131,778)
Distributions to Corporate from Subsidiaries		209,536	217,011	132,814
Minimum tax withholding paid on behalf of employees for stock awards		0	0	0
Excess income tax (provision)/benefit from stock-based compensation			0	0
Proceeds from exercise of stock options		0		0
Net Cash Provided by (Used in) Financing Activities		(66,258)	(8,158)	1,036
Net proceeds from issuance of common stock				0
Cash and Cash Equivalents, Period Increase (Decrease)		0	0	0
Cash and cash equivalents		$ 0	$ 0	$ 0	$ 0