Operating Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) years	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Leases [Abstract]
Rental properties, length of lease, minimum (in years) | years	1
Rental properties, length of lease, maximum (in years) | years	32
Operating Leases, Future Minimum Payments Receivable [Abstract]
2018	$ 474,608
2019	459,318
2020	446,051
2021	437,723
2022	422,306
Thereafter	3,656,516
Total	5,896,522
Rental expense	1,000	$ 681	$ 556
Operating Leases, Future Minimum Payments Due [Abstract]
2018	856
2019	856
2020	856
2021	884
2022	967
Thereafter	3,625
Total	$ 8,044