Related Party Transactions (Details) - Property Manager Transactions - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014		Sep. 30, 2015	Sep. 30, 2014		Dec. 31, 2014
Related Party Transactions [Abstract]
Property management fee percentage					4.00%
Property management fees	[1]	$ 2,272	$ 1,895		$ 6,864	$ 5,202
Leasing commissions	[2]	992	1,062		5,012	2,770
Construction management fees	[2]	345	191		756	441
Other fees and reimbursements		1,334	766	[3]	3,355	1,504	[3]
Total property manager fees and reimbursements		4,943	$ 3,914		15,987	$ 9,917
Property management fees, unpaid amount		686			686			$ 474
Leasing commissions, unpaid amount		196			196			191
Construction management fees, unpaid amount		111			111			73
Other fees and reimbursements, unpaid amount		737			737			0
Total property manager fees and reimbursements, unpaid amount		$ 1,730			$ 1,730			$ 738

[1] The property management fees are included in property operating on the consolidated statements of operations.

[2] Leasing commissions paid for leases with terms less than one year are expensed and included in depreciation and amortization on the consolidated statements of operations. Leasing commissions paid for leases with terms greater than one year and construction management fees are capitalized and amortized over the life of the related leases or assets.

[3] Other fees and reimbursements are included in property operating and general and administrative on the consolidated statements of operations.