Debt (Details) - USD ($)						1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 20, 2015	Jun. 23, 2015	Jun. 17, 2015	Feb. 15, 2015	Apr. 07, 2014	Jul. 31, 2015	Jul. 31, 2012	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Aug. 31, 2014	Feb. 04, 2011
Debt Instrument [Line Items]
Notes payable								$ 335,211,000		$ 335,211,000		$ 299,956,000
Interest payments								9,700,000	$ 100,000	22,000,000	$ 3,900,000
Stated interest rate (percent)		6.00%
Accrued interest paid		$ 1,500,000
Cash payments of notes payable										44,617,000	$ 5,421,000
Percentage of appraised value restriction					85.00%
Percentage of appraised value restriction of lots under development					65.00%
Percentage of appraised value restriction land					50.00%
Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 105,000,000
Conditional maximum borrowing capacity					175,000,000
Swing line maximum borrowing capacity					30,000,000
Borrowings outstanding								$ 0		$ 0
Line of Credit [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Amount drawn on credit facility						$ 40,000,000
TPG Aviator, L.P. [Member]
Debt Instrument [Line Items]
Repurchase amount			$ 20,000,000.0
Ownership percentage (percent)			41.00%
Cash payments of notes payable			$ 20,000,000.0
JPMorgan Chase Bank, N.A. [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 65,000,000
Citibank N.A. [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity													$ 40,000,000
7.50% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)								7.50%		7.50%		7.50%
Line of Credit [Member] | Senior Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding debt												$ 0
Senior Convertible Debt [Member] | 7.50% Notes [Member]
Debt Instrument [Line Items]
Outstanding debt								$ 46,793,000		$ 46,793,000		55,481,000
Stated interest rate (percent)														7.50%
Aggregate principal amount														$ 100,000,000.0
Repurchase amount		8,700,000
Senior Exchange Convertible Debt [Member] | 7.50% Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)							7.50%
Principal amount of debt retired							$ 44,500,000
Senior Exchange Convertible Debt [Member] | 7.50% Senior Exchange Convertible Notes [Member]
Debt Instrument [Line Items]
Outstanding debt								8,546,000		8,546,000		44,475,000
Stated interest rate (percent)							7.50%
Aggregate principal amount							$ 0
Redemption price (percent)				100.00%
Exchanged amount		15,400,000
Repurchase amount		$ 20,500,000
Senior Exchange Convertible Debt [Member] | 7.50% Senior Exchange Convertible Notes [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Redemption of aggregate principal amount	$ 8,500,000
Senior Notes [Member] | 8.5% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Outstanding debt								$ 200,000,000		$ 200,000,000		200,000,000
Stated interest rate (percent)								8.50%	8.50%	8.50%	8.50%
Aggregate principal amount									$ 200,000,000		$ 200,000,000
Senior Notes [Member] | 6.00% Senior Convertible Notes Due 2020 [Member]
Debt Instrument [Line Items]
Outstanding debt								$ 79,872,000		$ 79,872,000		$ 0
Stated interest rate (percent)		6.00%
Aggregate principal amount		$ 80,000,000
Proceeds from notes		64,500,000
Repurchase amount		$ 30,700,000