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Equity - Other share-based awards under the SIP (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other share-based awards under the SIP
Amount of Directors' retainer paid in stock	$ 120
Percentage of additional Directors' retainer paid in stock	50.00%
Total share-based compensation expense included in net income	$ 23,000	$ 18,000	$ 21,000
Restricted stock units (RSUs) | Director
Other share-based awards under the SIP
Minimum period over which deferred shares may be transferred after director's termination of service	6 months
Total share-based compensation expense included in net income	$ 2,000	$ 1,000	$ 1,000
Awards outstanding (in shares)	232
Carrying value of share units outstanding	$ 15,000

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Minimum period over which deferred shares may be transferred after grantee's termination of service.

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Represents the carrying value of units issued by the employer under other share-based awards.

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The amount of the non-employee director's retainer that is paid in shares of common stock or restricted stock.

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The percentage of additional amount of the Directors' retainer that is awarded in shares of common stock or restricted stock.

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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
-Topic 718
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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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