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Real Estate (Summary of Real Estate Subject to Operating Leases) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Property Subject to or Available for Operating Lease [Line Items] |  |
Real estate subject to operating leases, gross | $ 7,472,784 | $ 7,254,891
Less accumulated depreciation and amortization | (945,626) | (878,111)
Real estate subject to operating leases before work in process | 6,527,158 | 6,376,780
Accounted for using the operating method, net of accumulated depreciation and amortization | 6,609,368 | 6,418,700
Land and improvements |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Land and improvements | 2,316,395 | 2,287,100
Buildings and improvements |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Buildings and improvements | 5,152,418 | 4,962,530
Leasehold interests |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Leasehold interests | 3,971 | 5,261
Work in progress |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Work in progress for buildings and improvements | 82,210 | 41,920
Asset under Construction |  |
Property Subject to or Available for Operating Lease [Line Items] |  |
Land and improvements | $ 27,203 | $ 25,799

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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://fasb.org/us-gaap/role/ref/legacyRef -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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