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Subsequent Events - (Details) € in Millions |  |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2019 USD ($) | Jul. 24, 2017 USD ($) | Aug. 07, 2019 USD ($) property | Jun. 30, 2019 USD ($) property | Jun. 30, 2018 property | Jun. 30, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Jul. 02, 2018 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  |  | 11 | 13 |  |  |
Borrowings outstanding, credit facility |  |  |  | $ 259,527,000 |  |  | $ 363,894,000 |
Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Number of properties acquired | property |  |  | 6 |  |  |  |  |
Asset purchase price |  |  | $ 48,700,000 |  |  |  |  |
Credit Facility |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Weighted-average effective interest rate |  |  |  | 2.60% |  | 2.60% |  |
Credit Facility | Federal Funds |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Basis spread on base rate determination |  | 0.50% |  |  |  |  |  |
Credit Facility | LIBOR |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Basis spread on base rate determination |  | 1.00% |  |  |  |  |  |
Credit Facility | Unsecured debt | KeyBank National Association |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) |  | $ 725,000,000.0 |  | $ 906,200,000 |  |  |  |
Increase in aggregate commitments (up to) |  |  |  |  |  |  |  | $ 35,600,000
Total line of credit commitment |  |  |  |  |  |  |  | 950,000,000.0
Credit Facility | Unsecured debt | KeyBank National Association | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Increase in aggregate commitments (up to) | $ 39,400,000 |  |  |  |  |  |  |
Credit Facility Amendment | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | 1,235,000,000 |  |  |  |  |  |  |
Increase in aggregate commitments (up to) | 515,000,000.0 |  |  |  |  |  |  |
Total line of credit commitment | $ 1,750,000,000 |  |  |  |  |  |  |
Weighted-average effective interest rate | 2.30% |  |  |  |  |  |  |
Minimum | Credit Facility | Base Rate |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread |  | 0.60% |  |  |  |  |  |
Minimum | Credit Facility | LIBOR |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread |  | 1.60% |  |  |  |  |  |
Minimum | Credit Facility | Unsecured debt | KeyBank National Association |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) |  |  |  |  |  |  |  | 722,200,000
Maximum | Credit Facility | Base Rate |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread |  | 1.20% |  |  |  |  |  |
Maximum | Credit Facility | LIBOR |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread |  | 2.20% |  |  |  |  |  |
Maximum | Credit Facility | Unsecured debt | KeyBank National Association |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) |  |  |  |  |  |  |  | $ 914,400,000
Revolving Credit Facility | Credit Facility |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Borrowings outstanding, credit facility |  |  |  | 259,500,000 |  |  |  |
Borrowings outstanding, term loan |  |  |  | 170,700,000 |  |  |  |
Revolving Credit Facility | Credit Facility | Unsecured debt | KeyBank National Association |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) |  |  |  | 632,000,000.0 |  |  |  |
Borrowings outstanding, credit facility |  |  |  | 259,527,000 |  |  | $ 363,894,000 |
Revolving Credit Facility | Credit Facility Amendment | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 835,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | Credit Facility Amendment | Base Rate | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 0.45% |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | Credit Facility Amendment | LIBOR | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 1.45% |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | Credit Facility Amendment | Base Rate | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 1.05% |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | Credit Facility Amendment | LIBOR | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 2.05% |  |  |  |  |  |  |
Term Loan | Credit Facility |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Borrowings outstanding, credit facility |  |  |  | 277,400,000 |  |  |  |
Borrowings outstanding, term loan |  |  |  | $ 400,000,000.0 |  | € 359.6 |  |
Term Loan | Minimum | Credit Facility Amendment | Base Rate | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 0.40% |  |  |  |  |  |  |
Term Loan | Minimum | Credit Facility Amendment | LIBOR | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 1.40% |  |  |  |  |  |  |
Term Loan | Maximum | Credit Facility Amendment | Base Rate | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 1.00% |  |  |  |  |  |  |
Term Loan | Maximum | Credit Facility Amendment | LIBOR | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Interest rate spread | 2.00% |  |  |  |  |  |  |

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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 The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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