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Mortgages and Notes Payable - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |  |
Debt satisfaction gains (charges), net | $ 6,196,000 | $ (975,000) | $ 25,150,000 |
Interest paid, capitalized | $ 1,174,000 | $ 4,933,000 | 6,062,000 |
Mortgages and Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate | 4.60% | 4.60% |  |
Debt satisfaction gains (charges), net | $ 258,000 | $ (7,000) | 4,128,000 |
Unsecured Credit Agreement [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 1,105,000,000 |  |  |
Line of credit facility, maximum borrowing capacity with lender approval | $ 2,010,000,000 |  |  |
Minimum [Member] | Mortgages and Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage | 2.20% |  |  |
Effective interest percentage |  | 2.20% |  |
Maximum [Member] | Mortgages and Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage | 7.80% |  |  |
Effective interest percentage |  | 7.80% |  |
LCIF [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted-average interest rate | 4.80% | 4.70% |  |
Debt satisfaction gains (charges), net | $ 0 | $ (7,388,000) | (33,000) |
Interest paid, capitalized | 596,000 | 954,000 | 152,000 |
Co-borrower debt | $ 157,789,000 | $ 146,404,000 |  |
LCIF [Member] | Mortgages and Notes Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt satisfaction gains (charges), net |  |  | $ 33,000 |
LCIF [Member] | Unsecured Credit Agreement [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 1,105,000,000
Line of credit facility, maximum borrowing capacity with lender approval |  |  |  | $ 2,010,000,000
LCIF [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage | 4.00% | 4.00% |  |
LCIF [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt interest rate percentage | 6.50% | 6.50% |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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