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Activity for Real Estate Investments and Accumulated Depreciation (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Real Estate Investments [Abstract] |  |  |  |  |
Balance at beginning of year |  | $ 8,069,395,000 |  | $ 7,722,181,000 |
Acquisitions | [1] | 316,151,000 | $ 407,889,000 | 4,032,957,000 |
Less: FMV of Leases included in Acquisitions |  | (4,438,000) | (4,968,000) |  | $ (51,728,000)
Improvement and development |  | 165,000,000 | 186,043,000 | 130,824,000 |
Disposition of real estate assets | [2] | (330,340,000) | (241,750,000) | (114,681,000) |
Balance at end of year |  | 8,215,768,000 | 8,069,395,000 |  |
Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |  |  |  |
Balance at beginning of year |  | 1,373,678,000 |  | 1,138,315,000 |
Depreciation |  | 289,177,000 | 276,991,000 | 165,885,000 |
Disposition of real estate assets | [2] | (163,642,000) | (41,628,000) | (61,879,000) |
Balance at end of year |  | 1,499,213,000 | 1,373,678,000 |  |
Commercial |  |  |  |  |
Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |  |  |  |
Accumulated depreciation |  | 16,845,000 | 15,279,000 |  | 14,108,000
Assets Held-for-sale |  |  |  |  |
Real Estate Investments [Abstract] |  |  |  |  |
Balance at beginning of year |  | 0 |  | $ (4,897,000) |
Balance at end of year |  | 0 | 0 |  |
Real Estate and Accumulated Depreciation Disclosure [Abstract] |  |  |  |  |
Accumulated depreciation |  | $ 0 | $ 0 |  | $ (6,164,000)
[1] | Includes non-cash activity related to acquisitions.
[2] | Includes assets sold, casualty losses, and removal of certain fully depreciated assets.

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + 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 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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