Impairment of Real Estate and Impairment of Unconsolidated Entities (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Indicative bids [Member]
Non-recurring Impairment of Real Estate Including Discontiued Operations
Fair value of impairment of real estate	$ 34,750		$ 1,700
Fair value valuation technique	Indicative Bids		Indicative Bids
Fair value unobservable input	Indicative Bids		Indicative Bids
Fair value range of input values	N/A	[1]	N/A	[1]
Discounted cash flow [Member]
Non-recurring Impairment of Real Estate Including Discontiued Operations
Fair value of impairment of real estate	$ 44,200
Fair value valuation technique	Discounted Cash Flows
Market Capitalization Rate [Member] | Discounted cash flow [Member]
Non-recurring Impairment of Real Estate Including Discontiued Operations
Fair value unobservable input	Market Capitalization Rate
Market Capitalization Rate [Member] | Minimum [Member] | Discounted cash flow [Member]
Non-recurring Impairment of Real Estate Including Discontiued Operations
Percentage of input values impairment of real estate	8.00%
Market Capitalization Rate [Member] | Maximum [Member] | Discounted cash flow [Member]
Non-recurring Impairment of Real Estate Including Discontiued Operations
Percentage of input values impairment of real estate	10.00%
Discount rate [Member] | Discounted cash flow [Member]
Non-recurring Impairment of Real Estate Including Discontiued Operations
Fair value unobservable input	Discount Rate
Discount rate [Member] | Minimum [Member] | Discounted cash flow [Member]
Non-recurring Impairment of Real Estate Including Discontiued Operations
Percentage of input values impairment of real estate	10.50%
Discount rate [Member] | Maximum [Member] | Discounted cash flow [Member]
Non-recurring Impairment of Real Estate Including Discontiued Operations
Percentage of input values impairment of real estate	12.00%

[1] This fair value measurement was derived from a bona fide purchase offer from third party prospective buyers, subject to the Company's corroboration for reasonableness.