Intangibles - Summary of Carrying Amount of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Cost	$ 381,875	$ 301,462
Accumulated Amortization	(76,766)	(63,177)
Net	305,109	238,285
Liability
Cost	18,614	11,642
Accumulated amortization	(3,431)	(2,389)
Net	15,183	9,253
In-place lease intangible
Assets
Cost	282,468	222,394
Accumulated Amortization	(66,309)	(55,605)
Net	216,159	166,789
Above market in-place lease intangible
Assets
Cost	51,530	35,478
Accumulated Amortization	(9,392)	(6,909)
Net	42,138	28,569
Leasehold interest
Assets
Cost	712	712
Accumulated Amortization	(153)	(124)
Net	559	588
Below market in-place ground lease
Assets
Cost	47,165	42,878
Accumulated Amortization	(912)	(539)
Net	46,253	42,339
Below market in-place lease intangible
Liability
Below market lease, cost	13,098	10,297
Below market lease, accumulated amortization	(3,372)	(2,345)
Below Market Lease, Net	9,726	7,952
Above market ground leases
Liability
Cost	5,516	1,345
Accumulated amortization	(59)	(44)
Net	$ 5,457	$ 1,301