Aggregate dividends paid during the period for each share of common stock outstanding.

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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- Definition

Increase (decrease) in the number of shares under non-option equity instrument agreements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 13
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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Nov. 23, 2020	Apr. 30, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Unconverted restricted stock units						98,917	92,857
Common stock dividends paid			$ 46,399		$ 170,130
Restricted Stock Units (RSUs) [Member]
Increase in RSUs outstanding under the Stock Incentive Plan			6,060	17,595
Special Dividends [Member]
Common stock dividends paid								$ 216,500
Special Dividend I [Member]
Common dividend paid per share		$ 5.50
Special Dividend II [Member]
Common dividend paid per share	$ 1.50