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Real Estate (Summary of Real Estate Subject to Operating Leases) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Real estate subject to operating leases, gross | $ 5,815,108 | $ 5,164,322 |
Less accumulated depreciation and amortization | (620,188) | (508,229) |
Real estate subject to operating leases before work in process | 5,194,920 | 4,656,093 |
Work in progress | 61,354 | 28,908 | $ 60,720
Accounted for using the operating method, net of accumulated depreciation and amortization | 5,256,274 | 4,685,001 |
Revenue recognized | 153 | 1,521 | $ (338)
Allowances | 3,078 | 3,086 |
Balance of accrued rental income | 25,529 | 25,659 |
Land and improvements |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Land and improvements | 1,922,579 | 1,776,222 |
Buildings and improvements |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Buildings and improvements | 3,891,239 | 3,386,810 |
Leasehold interests |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Leasehold interests | 1,290 | 1,290 |
Work in progress |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Work in progress | $ 61,354 | $ 28,908 |

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- Definition This element represents revenue received, but not recognized for financial reporting purposes. Such deferred revenue may consist of and include amounts paid in advance by lessees and is net of the accumulated amortization of such amounts that to date have been recognized in revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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