Income Taxes (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Tax Credit Carryforward [Line Items]
Income tax benefit	$ (365,000)	$ 144,955,000	$ (43,381,000)	$ 117,820,000
Net operating loss carryforwards					150,758,000
Alternative minimum tax credit carryforward					28,570,000
Gain on disposition of rental properties	0	(125,000)	(58,000)	(5,960,000)
Net deferred tax asset not recorded					18,064,000
Charitable contribution deduction carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax carryforward					18,125,000
General business tax credit carryovers [Member]
Tax Credit Carryforward [Line Items]
Tax carryforward					$ 21,680,000