Debt (Five Year Maturity Schedule) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
2017	$ 72,316
2018	2,366
2019	84,456
2020	365,752
2021	200,000
Thereafter	275,000
Total debt principal payments	999,890
Mortgage loan premiums and deferred financing costs	(3,639)
Total debt	$ 996,251	$ 1,105,595