Debt - Schedule of Debt (Details) (USD $)	0 Months Ended	6 Months Ended																6 Months Ended
	Apr. 07, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Line of Credit [Member]	Apr. 07, 2014 Line of Credit [Member]	Mar. 31, 2014 4.5% Convertible Notes Due 2024 [Member] Convertible Debt [Member]	Dec. 31, 2013 4.5% Convertible Notes Due 2024 [Member] Convertible Debt [Member]	Jun. 30, 2014 7.50% Notes [Member]	Mar. 31, 2014 7.50% Notes [Member]	Dec. 31, 2013 7.50% Notes [Member]	Mar. 31, 2014 7.50% Notes [Member] Senior Convertible Debt [Member]	Dec. 31, 2013 7.50% Notes [Member] Senior Convertible Debt [Member]	Mar. 31, 2014 7.50% Senior Exchange Convertible Notes Member [Member] Senior Exchange Convertible Debt [Member]	Dec. 31, 2013 7.50% Senior Exchange Convertible Notes Member [Member] Senior Exchange Convertible Debt [Member]	Jun. 30, 2014 8.5% Senior Notes Due 2019 [Member] Senior Notes [Member]	Mar. 31, 2014 8.5% Senior Notes Due 2019 [Member] Senior Notes [Member]	Dec. 31, 2013 8.5% Senior Notes Due 2019 [Member] Senior Notes [Member]	Jun. 30, 2014 8.5% Senior Notes Due 2019 [Member] Senior Notes [Member] Prior to July 1, 2016 [Member]	Jun. 30, 2014 8.5% Senior Notes Due 2019 [Member] Senior Notes [Member] 2016 [Member]	Jun. 30, 2014 8.5% Senior Notes Due 2019 [Member] Senior Notes [Member] 2017 [Member]	Jun. 30, 2014 8.5% Senior Notes Due 2019 [Member] Senior Notes [Member] 2018 and thereafter [Member]
Debt Instrument [Line Items]
Outstanding debt						$ 0	$ 5,402,000				$ 55,481,000	$ 55,500,000	$ 44,500,000	$ 44,500,000		$ 200,000,000	$ 0
Interest payments		3,871,000	4,057,000
Aggregate principal amount															200,000,000
Stated interest rate (percent)								7.50%	7.50%	7.50%					8.50%
Redemption price percentage																		108.50%	106.375%	103.188%	100.00%
Redemption percentage of principal amount redeemed																		35.00%
Maximum borrowing capacity					65,000,000
Conditional maximum borrowing capacity					175,000,000
Swing line maximum borrowing capacity					30,000,000
Limitation to maximum borrowing capacity (in percent)	100.00%
Amount of assets under borrowing base				62,000,000
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%
Borrowings outstanding				$ 0