Common Stock, Voting Rights, Number

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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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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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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.

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- Definition

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

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Stockholders' equity (Details) - USD ($)	3 Months Ended			9 Months Ended
Stockholders' equity (Details) - USD ($)	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Stock options outstanding (shares)	3,168,000			3,168,000	3,080,000
Stockholders' Equity Attributable to Parent	$ 607,735,000	$ 592,511,000	$ 592,786,000	$ 607,735,000	$ 615,914,000	$ 554,995,000	$ 238,165,000	$ 211,471,000	$ 216,018,000
Stock Repurchase Program, Authorized Amount	100			100
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 68,400,000			$ 68,400,000
Treasury Stock, Shares, Acquired	1,540			4,462
Treasury Stock Acquired, Average Cost Per Share	$ 6.40			$ 7.09
Stock Repurchased During Period, Value	$ 9,856,000	11,762,000	10,000,000	$ 31,618,000
Treasury Stock [Member]
Class of Stock [Line Items]
Stockholders' Equity Attributable to Parent	$ (145,231,000)	$ (135,375,000)	$ (123,613,000)	$ (145,231,000)	$ (113,613,000)	$ (113,613,000)	$ (113,613,000)	$ (113,613,000)	$ (113,613,000)
Common Class A [Member]
Class of Stock [Line Items]
Common stock authorized (shares)	500,000,000			500,000,000	500,000,000
Common stock outstanding (shares)	129,655,000			129,655,000	129,815,000
Common Stock, Voting Rights, Number				1
Common Stock, Shares, Issued	129,655,000			129,655,000	129,815,000
Common Class B [Member]
Class of Stock [Line Items]
Common stock authorized (shares)	150,000,000			150,000,000	150,000,000
Common stock outstanding (shares)	26,259,000			26,259,000	26,659,000
Common Stock, Voting Rights, Number				10
Common Stock, Shares, Issued	26,259,000			26,259,000	26,659,000
Restricted Stock Units (RSUs) [Member]
Class of Stock [Line Items]
Restricted stock units outstanding (shares)	8,195,000			8,195,000	8,714,000
Performance Shares [Member]
Class of Stock [Line Items]
Restricted stock units outstanding (shares)	1,082,000			1,082,000	1,134,000