Lease Intangibles - Schedule of Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Amortizable Intangible Assets
Amortizable Intangible Assets, Gross Carrying Amount	$ 173,069	$ 103,988
Amortizable Intangible Assets, Accumulated Amortization	(58,485)	(51,395)
Amortizable Intangible Assets, Net Carrying Amount	114,584	52,593
Amortizable Intangible Liabilities
Amortizable Intangible Liabilities, Gross Carrying Amount	(137,032)	(65,607)
Amortizable Intangible Liabilities, Accumulated Amortization	32,004	33,799
Amortizable Intangible Liabilities, Net Carrying Amount	(105,028)	(31,808)
Below market rents, acquired	$ 73,000
Below market rents acquired, weighted average useful life	15 years 9 months 18 days
In-place lease and tenant relationships
Amortizable Intangible Assets
Amortizable Intangible Assets, Gross Carrying Amount	$ 156,420	84,443
Amortizable Intangible Assets, Accumulated Amortization	(47,827)	(37,996)
Amortizable Intangible Assets, Net Carrying Amount	108,593	46,447
Intangible assets acquired	$ 62,900
Acquired intangible assets, weighted average useful life	7 years 2 months 12 days
Above-market rent
Amortizable Intangible Assets
Amortizable Intangible Assets, Gross Carrying Amount	$ 16,649	19,545
Amortizable Intangible Assets, Accumulated Amortization	(10,658)	(13,399)
Amortizable Intangible Assets, Net Carrying Amount	5,991	$ 6,146
Intangible assets acquired	$ 700
Acquired intangible assets, weighted average useful life	5 years 9 months 18 days