Lease Intangibles - Schedule of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Amortizable Intangible Assets
Amortizable Intangible Assets, Gross Carrying Amount	$ 180,514	$ 173,069
Amortizable Intangible Assets, Accumulated Amortization	(64,143)	(58,485)
Amortizable Intangible Assets, Net Carrying Amount	116,371	114,584
Amortizable Intangible Liabilities
Amortizable Intangible Liabilities, Gross Carrying Amount	(138,476)	(137,032)
Amortizable Intangible Liabilities, Accumulated Amortization	34,903	32,004
Amortizable Intangible Liabilities, Net Carrying Amount	(103,573)	(105,028)
Below market rents, acquired	$ 1,400
Below market rents acquired, weighted average useful life	13 years 3 months 18 days
In-place lease and tenant relationships
Amortizable Intangible Assets
Amortizable Intangible Assets, Gross Carrying Amount	$ 163,219	156,420
Amortizable Intangible Assets, Accumulated Amortization	(53,027)	(47,827)
Amortizable Intangible Assets, Net Carrying Amount	110,192	108,593
Intangible assets acquired	$ 6,800
Acquired intangible assets, weighted average useful life	3 years 1 month 6 days
Above-market rent
Amortizable Intangible Assets
Amortizable Intangible Assets, Gross Carrying Amount	$ 17,295	16,649
Amortizable Intangible Assets, Accumulated Amortization	(11,116)	(10,658)
Amortizable Intangible Assets, Net Carrying Amount	6,179	$ 5,991
Intangible assets acquired	$ 600
Acquired intangible assets, weighted average useful life	3 years 8 months 12 days