Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Federal net operating carryforwards	$ 0	$ 26,884
State net operating loss carryforwards	9,763	20,759
Impairment losses	150,858	151,050
Prepaid income from land sales	5,522	10,210
Other	2,168	7,592
Total gross deferred tax assets	168,311	216,495
Valuation allowance	(6,653)	(95,953)
Total net deferred tax assets	161,658	120,542
Deferred tax liabilities:
Investment in real estate and property and equipment basis differences	767	1,726
Deferred gain on land sales and involuntary conversions	30,884	31,385
Prepaid pension asset	13,238	15,596
Installment sale	127,822	58,969
Total gross deferred tax liabilities	172,711	107,676
Total net deferred tax (liability) asset	$ (11,053)	$ 12,866