CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS-K (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net loss	$ (23,520)	$ (73,695)	$ (127,543)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation	50,683	29,637	19,455
Amortization	5,275	4,208	4,974
Amortization of deferred financing costs	4,378	2,952	1,418
Amortization of intangibles other than in-place leases	668	213	96
Straight-line rent amortization		(3,652)	(757)
Deferred income taxes	65,010	8,352	4,448
Gain on disposition of assets	(2,373)	(8,483)
Restricted stock and stock option amortization	8,200	5,782	4,277
Warrant liability loss	60,520	181,987	185,017
Reduction (increase) in tax indemnity receivable	(90)	1,206	20,260
Interest income related to tax indemnity	(21,510)	(2,078)	(8,111)
Loss on settlement of tax indemnity receivable	74,095
Equity in earnings from Real Estate and Other Affiliates, net of distributions	11,222	(7,121)	(35)
Provision for doubtful accounts	1,404	836	1,224
Master Planned Community land acquisitions	(100,913)	(5,667)
Master Planned Community development expenditures	(140,735)	(133,590)	(107,144)
Master Planned Community cost of sales	110,885	112,695	87,499
Condominium development expenditures	(75,990)	(21,213)
Condominium and other cost of sales	49,995	16,572	96
Proceeds from sale of condominium rights		47,500
Percentage of completion revenue recognition from sale of condominium rights and units	(83,565)	(32,969)
Non-monetary consideration relating to land transactions	(17,406)
Proceeds received on settlement of tax indemnity receivable	138,000
IRS payment for tax court decision	(203,298)
Net changes:
Accounts and notes receivable	45,209	5,935	51,571
Prepaid expenses and other assets	(6,311)	(1,591)	4,110
Condominium deposits received	139,187
Deferred expenses	(36,641)	(19,364)	(1,995)
Accounts payable and accrued expenses	37,213	20,333	15,112
Condominium deposits held in escrow	(139,187)
Other, net	(8,720)	547	(908)
Cash provided by (used in) operating activities	(58,315)	129,332	153,064
Cash Flows from Investing Activities:
Property and equipment expenditures	(8,521)	(31,768)	(1,226)
Operating property improvements	(6,299)	(17,231)	(14,201)
Property developments and redevelopments	(759,003)	(221,071)	(58,940)
Proceeds from insurance claims	12,901
Proceeds from dispositions	11,953	10,814
Acquisition of properties			(2,721)
Proceeds from sales of investment in Real Estate Affiliates		13,270	8,579
Investments in Real Estate and Other Affiliates, net	(6,248)	(4,035)	(4,552)
Change in restricted cash	20,930	(17,204)	(15,164)
Cash used in investing activities	(746,456)	(294,325)	(81,349)
Cash Flows from Financing Activities:
Proceeds from issuance of mortgages, notes and loans payable	597,553	1,120,102	68,410
Principal payments on mortgages, notes and loans payable	(120,182)	(279,721)	(55,832)
Deferred financing costs	(7,085)	(6,594)	(2,114)
Preferred dividend payment on behalf of REIT subsidiary	(12)	(12)
Distributions to noncontrolling interests		(3,031)
Purchase of Sponsors Warrants			(80,548)
Cash provided by (used in) financing activities	470,274	830,744	(70,084)
Net change in cash and cash equivalents	(334,497)	665,751	1,631
Cash and cash equivalents at beginning of period	894,948	229,197	227,566
Cash and cash equivalents at end of period	560,451	894,948	229,197
Supplemental Disclosure of Cash Flow Information:
Interest paid	84,497	30,600	28,857
Interest capitalized	46,513	37,470	27,571
Income taxes paid	204,898	2,268	1,202
Non-Cash Transactions:
Special Improvement District bond transfers associated with land sales	8,786	14,376	(3,033)
Property developments and redevelopments	38,567	85,609	8,384
Retirement of Sponsors Warrants and issuance of 1,525,272 shares of common stock			(76,264)
Millennium Waterway Apartments
Cash Flows from Investing Activities:
Distribution from Millennium Waterway Apartments			6,876
Acquisition of Properties:
Land			(15,917)
Building			(56,002)
Other assets			(2,670)
Mortgages, notes and loans payable			(55,584)
Other liabilities			(755)
Reduction in investments in Real Estate Affiliates due to the acquisition			(22,405)
Columbia Corporate Center 70 [Member]
Acquisition of Properties:
Land			(1,281)
Building			(13,089)
Other assets			(2,957)
Mortgages, notes and loans payable			(16,037)
Other liabilities			(1,290)
MPC Land contributed to Real Estate Affiliate			2,190
Purchase of land from GGP			(1,315)
Non-cash increase in property due to consolidation of real estate affiliate		3,750
Transfer of condominium buyer deposits to real estate affiliate		(34,220)
1701 Lake Robbins
Cash Flows from Investing Activities:
Acquisition of properties	(1,484)
Acquisition of Properties:
Land	(1,663)
Building	(3,725)
Other assets	(848)
Mortgages, notes and loans payable	(4,600)
Other liabilities	(152)
Columbia Corporate Center 10-60
Acquisition of Properties:
Land	(23,404)
Building	(79,247)
Other assets	(28,997)
Other liabilities	(1,648)
85 South Street
Cash Flows from Investing Activities:
Acquisition of properties	(20,071)
Non-Cash Transactions:
Accrued interest included in construction loan payable	4,785
Contribution of land to noncontrolling interests	2,818
Acquisition of Properties:
Building	(3,979)
Below market lease obligation	3,979
KR Holdings LLC
Cash Flows from Investing Activities:
Investments in Real Estate and Other Affiliates, net	9,386	(16,750)
Summerlin Las Vegas Baseball Club LLC
Cash Flows from Investing Activities:
Investments in Real Estate and Other Affiliates, net		$ (10,350)