Acquired Lease Intangibles Schedule of Future Amortization Expense and Minimum Rent (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Amortization Expense [Abstract]
2016	$ 53,506
Future Accretion, Year Two	26,646
2017	40,528
Future Accretion, Year Three	25,986
2018	32,344
Future Accretion, Year Four	24,239
2019	24,692
Future Accretion, Year Five	23,499
2020	19,605
Net Accretion [Abstract]
2016	27,768
Above/Below Market Ground Lease [Member]
Amortization Expense [Abstract]
2016	1,554
2017	1,554
2018	1,554
2019	1,554
2020	$ 1,554