Real Estate Investments - Impairment of Real Estate Investments Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) restaurant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges	$ 6,725	$ 160,500
Tenant file for bankruptcy, number of restaurants | restaurant		59
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of real estate assets deemed to be impaired	16,600	$ 623,000
Estimated fair value of real estate assets deemed to be impaired	$ 9,900	$ 462,500
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Period for determining disposal is more likely than not	12 months
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Period for determining disposal is more likely than not	24 months