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Accounting Policies - Real Estate and Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |
Real estate depreciation | $ 80,700 | $ 71,400 | $ 63,400
Total interest expense from continuing operations | 60,204 | 61,927 | 64,809
Capitalized interest | 658 | 2,142 | 1,236
Interest expense from continuing operations, net of capitalized interest | $ 59,546 | $ 59,785 | $ 63,573
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful Life | 3 years |  |
Minimum [Member] | Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful Life | 28 years |  |
Minimum [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful Life | 3 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful Life | 50 years |  |
Maximum [Member] | Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful Life | 50 years |  |
Maximum [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Useful Life | 30 years |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: 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=56944662&loc=d3e3602-108585 + Details
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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + 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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