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Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | $ 160,681 | $ 183,872
Intangible Assets, Accumulated Amortization | (88,203) | (72,249)
Intangible Assets, net | 72,478 | 111,623
Acquired Lease Intangibles, Gross |  | 48,956
Acquired Lease Intangibles, Accumulated Amortization |  | (23,301)
Acquired Lease Intangibles, Net | 18,119 | 25,655
Below market leases [Member] |  |
Intangible Assets [Line Items] |  |
Acquired Lease Intangibles, Gross | 37,579 | 50,025
Acquired Lease Intangibles, Accumulated Amortization | (19,460) | (24,178)
Acquired Lease Intangibles, Net | 18,119 | 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 | 142,889 | 161,276
Intangible Assets, Accumulated Amortization | (75,696) | (57,063)
Intangible Assets, net | 67,193 | 104,213
Tenant relationship value [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 13,074 | 20,117
Intangible Assets, Accumulated Amortization | (10,167) | (15,580)
Intangible Assets, net | 2,907 | 4,537
Above market leases acquired [Member] |  |
Intangible Assets [Line Items] |  |
Intangible Assets, Total Cost | 4,718 | 5,333
Intangible Assets, Accumulated Amortization | (2,340) | (1,879)
Intangible Assets, net | $ 2,378 | 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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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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