Organization and Basis of Presentation - Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Rental income - operating leases - continuing operations	$ 121,538
Rental income - operating leases - discontinued operations	10,204
Variable lease income - operating leases - continuing operations	35,348
Variable lease income - operating leases - discontinued operations	$ 3,060