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Real Estate (Real Estate And Accumulated Depreciation) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cost |  |  |  |
Balance, beginning of year |  | $ 1,476,173,000 | $ 1,450,951,000 |
Properties held for sale |  | (4,599,000) | (81,223,000) |
Properties acquired |  | 65,313,000 | 91,241,000 | $ 34,666,000
Impairments |  |  | (6,000) | (928,000)
Improvements and betterments |  | 13,140,000 | 15,210,000 | 13,581,000
Balance, end of year |  | 1,550,027,000 | 1,476,173,000 | 1,450,951,000
Accumulated depreciation |  |  |  |
Balance, beginning of the year |  | 267,211,000 | 251,605,000 |
Properties held for sale |  | (1,380,000) | (18,523,000) |
Depreciation expense | [1] | 35,001,000 | 34,129,000 | 41,066,000
Balance, end of the year |  | 300,832,000 | 267,211,000 | 251,605,000
Net book value |  | $ 1,249,195,000 | $ 1,208,962,000 | $ 1,199,346,000
[1] | 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 Amount of increase in real estate investments related to improvements 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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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