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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2018 | Jun. 30, 2018 | Apr. 30, 2018 | Feb. 28, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Total mortgage notes payable, unsecured notes and Term Loans |  |  |  |  | $ 7,547,792,000 |  | $ 7,547,792,000 |  | $ 7,404,313,000
Credit Facility |  |  |  |  | 56,000,000 |  | 56,000,000 |  | 0
Total mortgage notes payable, unsecured notes, Term Loans and Credit Facility |  |  |  |  | 7,603,792,000 |  | 7,603,792,000 |  | 7,404,313,000
Gain (Loss) on Extinguishment of Debt |  |  |  |  | (1,678,000) | $ 0 | (2,717,000) | $ (24,162,000) |
Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Fixed rate notes |  |  |  |  | 5,650,000,000 |  | 5,650,000,000 |  | 5,350,000,000
Variable rate notes |  |  |  |  | 300,000,000 |  | 300,000,000 |  | 300,000,000
Total mortgage notes payable, unsecured notes and Term Loans |  |  |  |  | 6,200,000,000 |  | 6,200,000,000 |  |
Amount of debt discount |  |  |  |  | 10,293,000 |  | 10,293,000 |  | 10,850,000
Amount of deferred financing costs, net |  |  |  |  | 35,762,000 |  | 35,762,000 |  | 36,386,000
Term Loans |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Variable rate notes |  |  |  |  | 250,000,000 |  | 250,000,000 |  | 250,000,000
Secured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Fixed rate notes |  |  |  |  | 534,629,000 |  | 534,629,000 |  | 593,987,000
Variable rate notes |  |  |  |  | 813,163,000 |  | 813,163,000 |  | 910,326,000
Total mortgage notes payable, unsecured notes and Term Loans |  |  |  |  | 1,191,080,000 |  | 1,191,080,000 |  |
Amount of debt discount |  |  |  |  | 14,618,000 |  | 14,618,000 |  | 16,351,000
Amount of deferred financing costs, net |  |  |  |  | 9,891,000 |  | 9,891,000 |  | 11,256,000
Notes Payable Maturities 2043 [Member] | Secured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  |  |  | $ 15,174,000 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | 426,000 |  |  |  |  |
Prepayment penalty |  |  |  | 152,000 |  |  |  |  |
Write off of deferred debt issuance cost |  |  |  | 274,000 |  |  |  |  |
Notes Payable Maturities 2018 | Secured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Total mortgage notes payable, unsecured notes and Term Loans |  |  |  |  | 0 |  | 0 |  |
Repayments of secured mortgages | $ 51,449,000 |  | $ 13,380,000 | $ 11,038,000 |  |  |  |  |
Notes Payable Maturities 2033 [Member] | Secured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  | $ 15,295,000 |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | 635,000 |  |  |  |  |  |  |
Prepayment penalty |  | 282,000 |  |  |  |  |  |  |
Write off of deferred debt issuance cost |  | $ 353,000 |  |  |  |  |  |  |
Notes Payable Maturities 2028 [Member] | Unsecured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Total mortgage notes payable, unsecured notes and Term Loans |  |  |  |  | 450,000,000 |  | 450,000,000 |  |
Notes Payable Maturities 2028 [Member] | Secured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured mortgages | 44,410,000 |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt | 1,678,000 |  |  |  |  |  |  |  |
Notes Payable Maturities 2018 and 2028 [Member] | Secured notes |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Repayments of secured mortgages | $ 95,859,000 |  |  |  |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |
Credit Facility |  |  |  |  | $ 56,000,000 |  | $ 56,000,000 |  | $ 0

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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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