Investments in Real Estate and Real Estate Under Construction - Schedule of Forward Purchase Commitments (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) ft²
Real Estate [Line Items]
Sq. Ft. | ft²	641
Warren, MI [Member] | Industrial Property [Member]
Real Estate [Line Items]
Letters of credit outstanding, amount | $	$ 4,600
Purchase Commitment [Member]
Real Estate [Line Items]
Sq. Ft. | ft²	475
Maximum Acquisition Cost | $	$ 71,725
Purchase Commitment [Member] | Grand Prairie, TX [Member] | Industrial Property [Member]
Real Estate [Line Items]
Sq. Ft. | ft²	215
Maximum Acquisition Cost | $	$ 24,725
Lease Term (Years)	20 years
Purchase Commitment [Member] | Warren, MI [Member] | Industrial Property [Member]
Real Estate [Line Items]
Sq. Ft. | ft²	260
Maximum Acquisition Cost | $	$ 47,000
Lease Term (Years)	15 years