Subsequent Events - Real Estate Investment Activity (Details) $ in Thousands	1 Months Ended	6 Months Ended
Jul. 26, 2018 USD ($) property	Jun. 30, 2018 USD ($) property
Acquisitions 2018 [Member]
Subsequent Event [Line Items]
Number of properties acquired \| property		19
Aggregate purchase price		$ 181,240
Subsequent Event [Member] \| Acquisitions 2018 [Member]
Subsequent Event [Line Items]
Number of properties acquired \| property	14
Aggregate purchase price	$ 74,200
Subsequent Event [Member] \| Property Disposition, 2018 [Member]
Subsequent Event [Line Items]
Number of real estate properties disposed \| property	10
Aggregate gross sales price	$ 43,100
Company's share of proceeds	39,300
Estimated gain on sale of properties	$ 7,300

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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-Name Accounting Standards Codification
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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

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- Definition

The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

+ References

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-Publisher FASB
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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Definition

Number of Real Estate Properties Disposed

+ References

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