Total number of common shares of an entity that have been sold or granted to shareholders (excludes common shares that were issued, repurchased and remain in the treasury and unvested, restricted shares issued). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued exclude shares outstanding and shares held in the treasury, and unvested, restricted shares issued.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of stock repurchase plan authorized.

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Stockholders' Equity - Capital Stock (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Aug. 15, 2018
Common Class B
Capital Stock
Common stock, shares issued	19,720,381	19,720,381
Common stock, shares outstanding	19,720,381
Common Class A
Capital Stock
Common stock, shares issued excluding treasury shares	20,241,173
Common stock, shares issued	25,439,375	25,202,314
Common stock, shares outstanding	20,241,173
Common Class A \| Maximum
Capital Stock
Authorized repurchase amount			$ 25