Payout per unit average 30 days closing price.

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Payout range maximum.

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Payout range minimum.

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Types of performance-based RSUs

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares issued under share-based payment arrangement.

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Stock-Based Compensation (Details) $ in Thousands	3 Months Ended			9 Months Ended
Stock-Based Compensation (Details) $ in Thousands	Sep. 30, 2019 USD ($) award	Jun. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) award shares	Sep. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $	$ 67		$ 403	$ 6,700	$ 6,400
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $		$ 1,400
Number of shares issued (in shares)		37,166
RSU \| Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)				65,822
Vesting period				3 years
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ultimate payout, minimum (as a percent)				0.00%
Ultimate payout, maximum (as a percent)				200.00%
Number of trading days used to determine average closing price				30 days
Performance-based RSUs \| Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Types of performance-based RSUs \| award	2			2
TSR RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)				65,247
FFO RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares)				27,963