Operating Leases - Lessor (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) ft² employees
Operating Leased Assets [Line Items]
Current Fiscal Year End Date	--12-31
Operating Leases, Future Minimum Payments Receivable [Abstract]
2016	$ 414,025
2017	372,266
2018	323,354
2019	278,450
2020	228,796
Thereafter	1,037,783
Total	$ 2,654,674
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	5 years
Operating Leases, Future Minimum Payments Receivable [Abstract]
Concentration Risk, Percentage	5.00%
Under 5,000 sqft [Member]
Operating Leased Assets [Line Items]
Operating leases, tenant space terms | ft²	5,000
Leases greater then 10,000sqft [Member]
Operating Leased Assets [Line Items]
Operating leases, tenant space terms | ft²	10,000