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Intangible Leases and Goodwill Intangible Assets and Liabilities Amortization Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 31,921 | $ 27,604 | $ 29,149
Amortization of intangible liabilities | (7,133) | (6,436) | (6,640)
Management Contracts |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | 2,900 | 0 | 0
Acquired In-place Leases |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | 30,966 | 28,812 | 29,970
Acquired Above-market Leases |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ 5,188 | $ 5,228 | $ 5,819

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- Definition Amount of amortization of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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