Debt - Aggregate Required Principal Payments (Details) - Mortgage notes payable - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortization
2019	$ 961
2020	3,938
2021	4,090
2022	5,628
2023	7,876
Thereafter	33,868
Total	56,361
Maturities
2019	0
2020	0
2021	0
2022	265,000
2023	0
Thereafter	1,355,422
Total	1,620,422
Total
2019	961
2020	3,938
2021	4,090
2022	270,628
2023	7,876
Thereafter	1,389,290
Total	$ 1,676,783	$ 1,929,612