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Real Estate Investments - Gross Carrying Value of Operating Properties (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Property, Plant and Equipment, Gross [Abstract] |  |
Land | $ 508,363 | $ 492,197
Tenant improvements | 415,529 | 444,038
Operating properties | 3,953,319 | 3,832,348
Total | 3,953,319 | 3,832,348
Building and Improvements [Member] |  |
Property, Plant and Equipment, Gross [Abstract] |  |
Operating properties | $ 3,029,427 | $ 2,896,113

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- Definition Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements. + 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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- Definition Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants. + 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(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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