Impairment of Real Estate and Impairment of Unconsolidated Entities (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Impairment of Real Estate Included in Continuing Operations [Line Items]
Impairment of Real Estate	$ 129,829,000	$ 1,175,000	$ 129,829,000	$ 1,175,000
Avenue at Tower City Center [Member]
Schedule of Impairment of Real Estate Included in Continuing Operations [Line Items]
Impairment of Real Estate	72,473,000	0	72,473,000	0
Terminal Tower [Member]
Schedule of Impairment of Real Estate Included in Continuing Operations [Line Items]
Impairment of Real Estate	42,208,000	0	42,208,000	0
Post Office Plaza [Member]
Schedule of Impairment of Real Estate Included in Continuing Operations [Line Items]
Impairment of Real Estate	14,378,000	0	14,378,000	0
Other [Member]
Schedule of Impairment of Real Estate Included in Continuing Operations [Line Items]
Impairment of Real Estate	$ 770,000	$ 1,175,000	$ 770,000	$ 1,175,000