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Intangible Assets and Liabilities - Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | $ 162,709 | $ 183,872
Intangible Assets, Accumulated Amortization | (81,502) | (72,249)
Intangible Assets, net | 81,207 | 111,623
Acquired Lease Intangibles, Gross | 37,731 | 48,956
Acquired Lease Intangibles, Accumulated Amortization | (18,000) | (23,301)
Acquired Lease Intangibles, Net | 19,731 | 25,655
Below market leases [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross |  | 50,025
Acquired Lease Intangibles, Accumulated Amortization |  | (24,178)
Acquired Lease Intangibles, Net |  | 25,847
Liabilities of assets held for sale [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross |  | 1,069
Acquired Lease Intangibles, Accumulated Amortization |  | (877)
Acquired Lease Intangibles, Net |  | 192
In-place lease value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 143,856 | 161,276
Intangible Assets, Accumulated Amortization | (68,400) | (57,063)
Intangible Assets, net | 75,456 | 104,213
Tenant relationship value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 14,135 | 20,117
Intangible Assets, Accumulated Amortization | (10,938) | (15,580)
Intangible Assets, net | 3,197 | 4,537
Above market leases acquired [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 4,718 | 5,333
Intangible Assets, Accumulated Amortization | (2,164) | (1,879)
Intangible Assets, net | $ 2,554 | 3,454
Intangible assets including assets held for sale [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost |  | 186,726
Intangible Assets, Accumulated Amortization |  | (74,522)
Intangible Assets, net |  | 112,204
Assets held for sale [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost |  | 2,854
Intangible Assets, Accumulated Amortization |  | (2,273)
Intangible Assets, net |  | $ 581

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