Real Estate Sales (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended		24 Months Ended										1 Months Ended	3 Months Ended	6 Months Ended		0 Months Ended	1 Months Ended		3 Months Ended	6 Months Ended
	Apr. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2008	Mar. 05, 2014	Dec. 31, 2013	Jun. 30, 2014 Rivers Edge CDD Assessments Community Development District Debt	Apr. 02, 2014 Rivers Edge CDD Assessments Community Development District Debt	Mar. 31, 2014 Rivers Edge CDD Assessments Community Development District Debt	Jun. 30, 2014 Interest Bearing Homebuilder Note, RiverTown Sale	Apr. 02, 2014 Interest Bearing Homebuilder Note, RiverTown Sale	Apr. 30, 2014 Northwest Florida Timber Finance, LLC Notes Receivable	Jun. 30, 2014 Buyer Special Purpose Entity	Apr. 30, 2014 Special Purpose Entities	Jun. 30, 2014 Special Purpose Entities	Jun. 30, 2014 Special Purpose Entities	Apr. 30, 2014 Special Purpose Entities Notes Receivable	Mar. 05, 2014 AgReserves Sale acre	Apr. 30, 2014 AgReserves Sale	Apr. 30, 2014 RiverTown Sale	Jun. 30, 2014 RiverTown Sale	Jun. 30, 2014 RiverTown Sale	Apr. 02, 2014 RiverTown Sale acre	Apr. 02, 2014 RiverTown Sale Minimum	Apr. 02, 2014 RiverTown Sale 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
Sale of real estate																				511,100,000
Other operating expenses		2,736,000	3,213,000	7,154,000	6,138,000															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
Investments held by special purpose entities		210,463,000		210,463,000			203,500,000	0
Debt instrument, face amount	180,000,000
Debt interest rate	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	20,000,000					14,300,000
Discount and issuance costs				4,300,000	0											4,300,000
Investments contributed to special purpose entity by the Company																	7,000,000	7,000,000
Administrative costs associated with special purpose entities		3,746,000	0	3,746,000	0
Percent ownership in special purpose entity		0.00%		0.00%
Assets held by special purpose entities																	213,900,000	213,900,000
Liabilities held by special purpose entities																	179,500,000	179,500,000
Time deposits															200,000,000
Accrued investment income receivable															2,000,000
U.S. treasury securities		524,800,000		524,800,000													9,600,000	9,600,000
Cash																	800,000	800,000
Debt issuance cost																	1,500,000
Senior notes held by special purpose entity		177,301,000		177,301,000				0									177,300,000	177,300,000
Unamortized discount (premium), net																	2,800,000	2,800,000
Deposit liabilities, accrued interest																	2,200,000	2,200,000
Interest income from investments in special purpose entities		2,018,000	0	2,018,000	0												2,000,000	2,000,000
Interest expense in special purpose entity		2,071,000	0	2,071,000	0												2,100,000	2,100,000
U.S. Treasury securities maturing within one year																	700,000	700,000
U.S. Treasury securities maturing after one year through five years																	3,800,000	3,800,000
U.S. Treasury securities maturing after five years through ten years																	3,100,000	3,100,000
U.S. Treasury securities maturing after ten years																	2,000,000	2,000,000
Proposed land sale, area of land (in acres)																				380,000					4,057
Percentage of notes receivable												5.25%	5.25%
Principal payment													1,000,000.0
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
Gain on sale																							26,000,000	26,000,000
Long term debt		54,253,000		54,253,000				44,217,000		11,000,000
Community development district debt		$ 22,100,000		$ 22,100,000				$ 34,800,000	$ 11,000,000		$ 5,400,000