Real Estate Sales Real Estate Sales (Details) (USD $)	3 Months Ended			12 Months Ended			3 Months Ended	1 Months Ended					0 Months Ended		0 Months Ended	1 Months Ended			1 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2008	Dec. 31, 2013	Mar. 31, 2014 Community Development District Debt Rivers Edge CDD Assessments	Mar. 31, 2014 Buyer Special Purpose Entity Maximum	Apr. 30, 2014 Subsequent Event	Apr. 02, 2014 Subsequent Event Community Development District Debt Rivers Edge CDD Assessments	Apr. 30, 2014 Subsequent Event Northwest Florida Timber Finance, LLC Notes Receivable	Apr. 02, 2014 Subsequent Event Buyer Special Purpose Entity	Mar. 31, 2014 Subsequent Event Buyer Special Purpose Entity	Mar. 05, 2014 AgReserves Sale	Nov. 06, 2013 AgReserves Sale acre	Apr. 02, 2014 AgReserves Sale Subsequent Event	Apr. 30, 2014 AgReserves Sale Subsequent Event	Mar. 31, 2014 RiverTown Sale		Apr. 30, 2014 RiverTown Sale Subsequent Event	Apr. 02, 2014 RiverTown Sale Subsequent Event acre	Apr. 02, 2014 RiverTown Sale Subsequent Event Minimum	Apr. 02, 2014 RiverTown Sale Subsequent Event Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proposed land sale, purchase price													$ 562,000,000							$ 24,000,000
Sales of real estate													511,100,000
Other operating expenses	4,418,000		2,925,000										1,200,000
Proceeds from sale of real estate													358,500,000
Disposal group consideration, notes receivable													200,000,000							19,600,000
Maturity of notes receivables				15 years									15 years		15 years	15 years
Investments held by special purpose entity	203,492,000				0
Debt instrument, face amount								180,000,000
Debt interest rate									5.25%	4.75%	4.006%
Issue price of senior secured notes										98.483%
Proceeds from (repayments of) accounts receivable securitization								165,000,000
Cost of monetization								15,000,000
Retained interest promissory note receivable	14,300,000							20,000,000
Time deposits												200,000,000
U.S. treasury securities	434,800,000											2,700,000
Cash												800,000
U.S. Treasury securities maturing within one year	200,000
U.S. Treasury securities maturing after one year through five years	900,000
U.S. Treasury securities maturing after five years through ten years	900,000
U.S. Treasury securities maturing after ten years	700,000
Interest income (expense), net							100,000
Proposed land sale, area of land (in acres)														380,000						4,057
Long term debt	49,415,000	[1]			44,217,000	11,000,000			11,000,000
Principal payment									1,000,000
Proposed land sale, expected impact fee credit																					20,000,000	26,000,000
Proposed land sale, expected impact fee credit, period for recognition																			5 years
Carrying amount of the assets and liabilities expected to be included in the Sale
Investment in real estate, net																	22,369,000
Other assets																	202,000
Total assets																	22,571,000
Debt																	5,391,000	[2]
Accrued liabilities and deferred credits																	317,000
Total liabilities held for sale																	5,708,000
Net carrying value																	16,863,000
Gain on sale																	$ 26,000,000

[1] Includes debt defeased in connection with the sale of the Company’s office portfolio in the amount of $26.1 million.

[2] Only Rivers Edge CDD assessments for platted property have been recorded as a liability. The Company's total outstanding Rivers Edge CDD assessments at March 31, 2014 were $11.0 million.