Discontinued Operations and Dispositions of Real Estate - QCP (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Oct. 31, 2016 property
Costs and expenses:
Depreciation and amortization			$ 0	$ (2,934)
Income tax expense	$ 0	$ (176)	$ 0	(49,510)
QCP | Discontinued Operations, Held-for-sale
Revenues:
Rental and related revenues		6,908		13,722
Tenant recoveries		399		761
Income from direct financing leases		116,453		229,511
Total revenues		123,760		243,994
Costs and expenses:
Depreciation and amortization		(1,467)		(2,934)
Operating		(1,045)		(2,043)
General and administrative		(14)		(62)
Acquisition and pursuit costs		(13,704)		(13,704)
Other income, net		21		42
Income before income taxes		107,551		225,293
Income tax expense		(176)		(49,510)
Total discontinued operations		$ 107,375		$ 175,783
QCP | Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | property					338