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Schedule III - Real Estate and Accumulated Depreciation (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Federal income tax purposes | $ 1,700,000 |  |
Real Estate: |  |  |
Beginning balance | 2,255,260 | $ 2,214,057 |
Additions to/improvements of real estate | 255,527 | 49,685 | $ 191,846
Assets sold/written-off | (8,943) | (8,482) | (4,661)
Ending balance | 2,501,844 | 2,255,260 | 2,214,057
Accumulated Depreciation |  |  |
Beginning balance | 429,814 | 371,563 |
Depreciation expense | 65,723 | 60,856 | 57,746
Assets sold/written-off | (2,955) | (2,605) | (3,767)
Ending balance | $ 492,582 | $ 429,814 | $ 371,563
Land improvements |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful life | 7 years |  |
Building |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful life | 50 years |  |
Buildings and improvements | Minimum |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful life | 7 years |  |
Buildings and improvements | Maximum |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful life | 15 years |  |
Leasehold improvements |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Useful life | 15 years |  |

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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 decrease to accumulated depreciation for real estate investments sold 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.FN4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of 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 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 + Details
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