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Held For Sale/Disposed Assets (Narrative) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($) property | Jun. 30, 2017 USD ($) property
Held For Sale Assets [Line Items] |  |
Number of properties | property | 195 |
Discontinued Operations, Held-for-sale [Member] |  |
Held For Sale Assets [Line Items] |  |
Number of properties | property | 0 |
Los Angeles [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |
Held For Sale Assets [Line Items] |  |
Number of properties sold | property |  | 1
Proceeds from sale of property |  | $ 25.3
Gain on sale of property |  | $ 10.1
Washington D.C. [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |
Held For Sale Assets [Line Items] |  |
Number of properties sold | property | 1 |
Proceeds from sale of property | $ 20.3 |
Gain on sale of property | $ 3.3 |
Miami [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |
Held For Sale Assets [Line Items] |  |
Number of properties sold | property | 1 |
Proceeds from sale of property | $ 24.3 |
Gain on sale of property | $ 11.7 |

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- Definition Held For Sale Assets [Line Items] + References No definition available. + Details
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- Definition Number Of Real Estate Properties Sold + References No definition available. + Details
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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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