Discontinued Operations and Dispositions of Real Estate - QCP (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Oct. 31, 2016 property
Costs and expenses:
Depreciation and amortization			$ 0	$ (4,401)
Income tax benefit (expense)	$ 0	$ 1,789	$ 0	(47,721)
QCP | Discontinued Operations, Held-for-sale
Revenues:
Rental and related revenues		6,898		20,620
Tenant recoveries		386		1,147
Income from direct financing leases		116,429		345,940
Total revenues		123,713		367,707
Costs and expenses:
Depreciation and amortization		(1,467)		(4,401)
Operating		(1,033)		(3,076)
General and administrative		(6)		(68)
Acquisition and pursuit costs		(14,805)		(28,509)
Other income (expense), net		22		64
Income (loss) before income taxes		106,424		331,717
Income tax benefit (expense)		1,789		(47,721)
Total discontinued operations		$ 108,213		$ 283,996
QCP | Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | property					338