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Indebtedness (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) | Mar. 31, 2018 USD ($) property building note | Mar. 31, 2017 USD ($) | May 09, 2018 USD ($) | Dec. 31, 2017 USD ($)
Indebtedness |  |  |  |  |
Number of public issues of unsecured senior notes | note |  | 7 |  |  |
Total real estate properties, gross |  | $ 7,958,274 |  |  | $ 7,824,763
Unsecured revolving credit facility |  | 55,000 |  |  | $ 596,000
Unsecured revolving credit facility |  |  |  |  |
Indebtedness |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  | 1,000,000 |  |  |
Line of credit facility, periodic payment, principal |  | $ 0 |  |  |
Revolving credit facility, interest rate payable (as a percent) |  | 2.90% |  |  |
Weighted average interest rate on debt (as a percent) |  | 2.70% | 2.10% |  |
Unsecured revolving credit facility |  | $ 55,000 |  |  |
Revolving credit facility, available amount |  | 945,000 |  |  |
Interest expense and other associated costs incurred |  | 4,077 | $ 2,830 |  |
Option to increase the borrowing capacity under revolving credit facility |  | $ 2,000,000 |  |  |
Unsecured revolving credit facility | LIBOR |  |  |  |  |
Indebtedness |  |  |  |  |
Interest rate added to the base rate (as a percent) |  | 1.20% |  |  |
Debt instrument, facility fee (as a percent) |  | 0.25% |  |  |
Unsecured revolving credit facility | Subsequent Event |  |  |  |  |
Indebtedness |  |  |  |  |
Unsecured revolving credit facility |  |  |  | $ 35,000 |
Revolving credit facility, available amount |  |  |  | $ 965,000 |
Senior unsecured notes due 2019 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 400,000 |  |  |
Interest rate (as a percent) |  | 3.25% |  |  |
Senior unsecured notes due 2020 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 200,000 |  |  |
Interest rate (as a percent) |  | 6.75% |  |  |
Senior unsecured notes due 2021 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 300,000 |  |  |
Interest rate (as a percent) |  | 6.75% |  |  |
Senior unsecured notes due 2024 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 250,000 |  |  |
Interest rate (as a percent) |  | 4.75% |  |  |
Senior unsecured notes due 2028 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 500,000 |  |  |
Interest rate (as a percent) | 4.75% | 4.75% |  |  |
Proceeds from debt, net of issuance costs | $ 487,264 |  |  |  |
Proceeds from issuance of debt | $ 500,000 |  |  |  |
Senior unsecured notes due 2042 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 350,000 |  |  |
Interest rate (as a percent) |  | 5.625% |  |  |
Senior unsecured notes due 2046 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 250,000 |  |  |
Interest rate (as a percent) |  | 6.25% |  |  |
Term loan due 2020 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 350,000 |  |  |
Interest rate (as a percent) |  | 3.10% |  |  |
Weighted average interest rate on debt (as a percent) |  | 3.10% | 2.20% |  |
Interest expense and other associated costs incurred |  | $ 2,766 | $ 2,043 |  |
Maximum borrowing capacity that may be increased |  | $ 700,000 |  |  |
Term loan due 2020 | LIBOR |  |  |  |  |
Indebtedness |  |  |  |  |
Interest rate added to the base rate (as a percent) |  | 1.40% |  |  |
Term loan due 2022 |  |  |  |  |
Indebtedness |  |  |  |  |
Debt face amount |  | $ 200,000 |  |  |
Interest rate (as a percent) |  | 3.20% |  |  |
Weighted average interest rate on debt (as a percent) |  | 3.00% | 2.60% |  |
Interest expense and other associated costs incurred |  | $ 1,564 | $ 1,359 |  |
Maximum borrowing capacity that may be increased |  | $ 400,000 |  |  |
Term loan due 2022 | LIBOR |  |  |  |  |
Indebtedness |  |  |  |  |
Interest rate added to the base rate (as a percent) |  | 1.35% |  |  |
Mortgages |  |  |  |  |
Indebtedness |  |  |  |  |
Aggregate principal amount of mortgage debt |  | $ 818,457 |  |  |
Number of properties mortgaged | property |  | 24 |  |  |
Number of buildings mortgaged | building |  | 25 |  |  |
Total real estate properties, gross |  | $ 1,245,304 |  |  |
Capital leases |  |  |  |  |
Indebtedness |  |  |  |  |
Total real estate properties, gross |  | $ 36,238 |  |  |
Number of properties recorded under capital lease | property |  | 2 |  |  |
Capital leases |  | $ 10,484 |  |  |

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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://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)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of real estate investment property 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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