Information by Business Segment (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reconciliation of segment revenues to total revenues
Segment revenues from real estate operations	$ 133,924	$ 128,195	$ 267,011	$ 250,905
Construction contract and other service revenues	12,003	42,172	23,223	80,496
Less: Revenues from discontinued operations	0	(4)	0	(4)
Total revenues	145,927	170,363	290,234	331,397
Reconciliation of segment property operating expenses to property operating expenses
Segment property operating expenses	48,141	46,407	100,016	97,093
Less: Property operating expenses from discontinued operations	0	11	0	6
Total property operating expenses	48,141	46,418	100,016	97,099
Computation of net operating income from service operations
Construction contract and other service revenues	12,003	42,172	23,223	80,496
Construction contract and other service expenses	(11,478)	(41,293)	(22,172)	(78,791)
NOI from service operations	525	879	1,051	1,705
Reconciliation of NOI from real estate operations and NOI from service operations to (loss) income from continuing operations
NOI from real estate operations	85,783	81,788	166,995	153,812
NOI from service operations	525	879	1,051	1,705
Interest and other income	1,330	1,242	2,486	2,525
Equity in income of unconsolidated entities	10	9	20	34
Income tax (expense) benefit	(1)	(50)	7	(105)
Other adjustments:
Depreciation and other amortization associated with real estate operations	(33,248)	(33,786)	(67,775)	(65,385)
Impairment losses	(69,692)	(1,238)	(72,138)	(1,238)
General, administrative and leasing expenses	(8,026)	(7,534)	(19,909)	(15,425)
Business development expenses and land carry costs	(2,363)	(2,623)	(4,781)	(5,413)
Interest expense	(22,639)	(21,768)	(46,198)	(42,606)
NOI from discontinued operations	0	(15)	0	(10)
Gain (loss) on early extinguishment of debt	5	(65)	22	(68)
(Loss) income from continuing operations	$ (48,316)	$ 16,839	$ (40,220)	$ 27,826