Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended								3 Months Ended		9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2014 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring [Member]	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring [Member]	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring [Member]	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring [Member]	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total impairment losses, investment properties	$ 2,337	[1]	$ 39,942	[2]	$ 80,281	[3]	$ 225,009	[4]					$ 2,337	$ 39,942	$ 80,281	$ 225,009
Assets, Fair Value Disclosure, Quarter																	12,643	67,225
Assets, Fair Value Disclosure									$ 3,698	$ 8,059	$ 0	$ 0					$ 155,623	$ 223,443

[1] Total provision for asset impairment included $1,667 related to one lodging property and $670 related to one non-core property.

[2] Total provision for asset impairment included $26,175 related to two lodging properties, $11,723 related to three retail properties and $2,044 related to four non-core properties.

[3] Total provision for asset impairment included $4,665 related to two lodging properties and $75,616 related to five non-core properties.

[4] Total provision for asset impairment included $26,175 related to two lodging properties, $21,179 related to four retail properties and $177,655 related to eleven non-core properties.