Debt - Schedule of Maturities of Long-term Debt (Details) - Mortgages [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
2018 Amortization	$ 4,417
2019 Amortization	3,790
2020 Amortization	3,938
2021 Amortization	4,090
2022 Amortization	5,455
Thereafter	37,890
Total Amortization	59,580
2018 Maturities	262,195
2019 Maturities	250,000
2020 Maturities	0
2021 Maturities	0
2022 Maturities	265,000
Thereafter	864,449
Total Maturities	1,641,644
2018	266,612
2019	253,790
2020	3,938
2021	4,090
2022	270,455
Thereafter	902,339
Total	$ 1,701,224	$ 1,617,840