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Schedule III - Real Estate And Accumulated Depreciation (Changes In Real Estate And Accumulated Depreciation) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Real estate balance, beginning of the year |  | $ 1,550,027,000 |  | $ 1,476,173,000 | $ 1,450,951,000
Properties transferred to held for sale |  | (96,596,000) |  | (4,599,000) | (81,223,000)
Properties acquired |  | 39,456,000 |  | 65,313,000 | 91,241,000
Impairments |  |  |  |  | (6,000)
Improvements and betterments |  | 15,672,000 |  | 13,140,000 | 15,210,000
Write-off fully-depreciated assets |  | (12,130,000) |  |  |
Real estate balance, end of the year |  | 1,496,429,000 | [1] | 1,550,027,000 | 1,476,173,000
Accumulated depreciation balance, beginning of the year |  | 300,832,000 |  | 267,211,000 | 251,605,000
Properties transferred held for sale |  | (11,280,000) |  | (1,380,000) | (18,523,000)
Depreciation expense | [2] | 35,648,000 |  | 35,001,000 | 34,129,000
Write-off fully-depreciated assets |  | (12,130,000) |  |  |
Accumulated depreciation balance end of the year |  | 313,070,000 |  | 300,832,000 | 267,211,000
Net book value |  | 1,183,359,000 |  | $ 1,249,195,000 | $ 1,208,962,000
Difference between recorded cost of real estate and cost for federal tax purposes |  | $ 26,500,000 |  |  |
Minimum [Member] |  |  |  |  |
Estimated useful life of buildings and improvements |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |
Estimated useful life of buildings and improvements |  | 40 years |  |  |
[1] | At December 31, 2016, the aggregate cost for federal income tax purposes was approximately $26.5 million greater than the Company's recorded values.
[2] | Depreciation is provided over the estimated useful lives of the buildings and improvements, which range from 3 to 40 years.

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- Definition Real Estate Cost In Excess Of Cost For Federal Income Tax Purpose + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition Amount of other deductions to accumulated depreciation, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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