Real Estate Investments - Dispositions (Details) - Subsequent Event [Member] - Real Estate Dispositions [Member] $ in Millions		1 Months Ended
	Oct. 14, 2016 USD ($) ft²	Oct. 31, 2016 USD ($) ft²
KANSAS
Real Estate Dispositions [Line Items]
Square footage | ft²	70,908
Net real estate investment	$ 7.2
Sales price	15.1
Gain on disposition of property	$ 7.6
TENNESSEE
Real Estate Dispositions [Line Items]
Square footage | ft²		45,274
Net real estate investment		$ 6.3
Sales price		8.8
Net proceeds		8.6
Closing costs		0.2
Gain on disposition of property		$ 2.1
Mortgages [Member] | TENNESSEE
Real Estate Dispositions [Line Items]
Stated interest rate (percent)		7.63%
Outstanding principal		$ 0.1