Impairment of Real Estate and Impairment of Unconsolidated Entities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Impairment of Real Estate Included in Continuing Operations [Line Items]
Impairment of Real Estate	$ 966,000	$ 0	$ 130,795,000	$ 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	0	0	72,473,000	0
Terminal Tower [Member]
Schedule of Impairment of Real Estate Included in Continuing Operations [Line Items]
Impairment of Real Estate	0	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	0	0	14,378,000	0
Other [Member]
Schedule of Impairment of Real Estate Included in Continuing Operations [Line Items]
Impairment of Real Estate	$ 966,000	$ 0	$ 1,736,000	$ 1,175,000