Acquired In-Place Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Balance of acquired below market leases	$ 133,400	$ 109,800
Accumulated amortization of below market leases	40,700	37,000
Amortization from acquired below market lease	7,100	5,800	$ 5,900
Below Market Leases
2016	8,080
2017	7,036
2018	5,849
2019	5,469
2020	4,602
Thereafter	61,678
Total future amortization expense from acquired below market leases	92,714
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Balance of acquired above market leases	39,400	32,700
Accumulated amortization of acquired above market leases	22,900	19,300
Amortization from acquired above market leases	$ 4,400	$ 3,400	$ 2,800
Weighted-average amortization period	4 years 5 months
Above Market Leases
2016	$ 4,629
2017	3,189
2018	2,369
2019	1,236
2020	983
Thereafter	4,131
Total future amortization expense from acquired above market leases	$ 16,537
Below Market Lease [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period	20 years 6 months