Fair Value Measures - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) property	Mar. 31, 2016 USD ($) property
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties impaired | property	14	125
Impairment charges	$ 6,725	$ 160,500
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates	7.80%
Capitalization rates	7.20%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capitalization rates	7.50%
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Capitalization rates	7.40%
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of real estate assets deemed to be impaired	$ 9,900	462,500
Carrying value of real estate assets deemed to be impaired	$ 16,600	$ 623,000