Operating Leases - Lessor (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) ft² employees
Operating Leased Assets [Line Items]
Current Fiscal Year End Date	--12-31
Operating Leases, Future Minimum Payments Receivable [Abstract]
2017	$ 434,070
2018	390,872
2019	346,356
2020	295,289
2021	241,549
Thereafter	990,609
Total	$ 2,698,745
Customer Concentration Risk - Number | employees	0
Concentration Risk, Percentage	5.00%
Minimum [Member]
Operating Leased Assets [Line Items]
Operating leases, lease year range	3 years
Operating leases, lease year range for tenant space greater than 10,000 sq ft	5 years
Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases, lease year range	7 years
Operating Leases, Future Minimum Payments Receivable [Abstract]
Concentration Risk, Percentage	5.00%
Leases less than 10,000 sqft [Member]
Operating Leased Assets [Line Items]
Operating leases, tenant space terms | ft²	10,000
Leases greater then 10,000sqft [Member]
Operating Leased Assets [Line Items]
Operating leases, tenant space terms | ft²	10,000