Common Stock, Conversion Ratio

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Common Stock, Voting Rights, Number

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Outstanding

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Stockholders' Equity Note, Outstanding Shares Less than 10% of Aggregate Shares Outstanding, Conversion Ratio

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

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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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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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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stockholders' equity (Details)	12 Months Ended
Stockholders' equity (Details)	Dec. 31, 2022 USD ($) shares $ / shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Class of Stock [Line Items]
Stock options outstanding (shares)	3,089,000	3,080,000
Common stock available for future grants (shares)	51,603,000
Stockholders' Equity Note, Outstanding Shares Less than 10% of Aggregate Shares Outstanding, Conversion Ratio	1
Stockholders' Equity Attributable to Parent \| $	$ 611,559,000	$ 615,914,000	$ 216,018,000	$ 233,529,000
Stock Repurchase Program, Authorized Amount \| $	100
Stock Repurchase Program, Remaining Authorized Repurchase Amount \| $	$ 60,400,000
Treasury Stock, Shares, Acquired	5,967
Treasury Stock Acquired, Average Cost Per Share \| $ / shares	$ 6.64
Stock Repurchased During Period, Value \| $	$ 39,619,000
Treasury Stock, Value, Acquired, Cost Method \| $	39,618,000
Treasury Stock [Member]
Class of Stock [Line Items]
Stockholders' Equity Attributable to Parent \| $	$ (153,231,000)	$ (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
Common stock outstanding (shares)	128,629,000	129,815,000
Common Stock, Voting Rights, Number	1
Common Stock, Conversion Ratio	1
Common Stock, Shares, Issued	128,629,000	129,815,000
Common Stock, Voting Rights	one
Common Class B [Member]
Class of Stock [Line Items]
Common stock authorized (shares)	150,000,000	150,000,000
Common stock outstanding (shares)	26,259,000	26,659,000
Common Stock, Voting Rights, Number	10
Common Stock, Shares, Issued	26,259,000	26,659,000
Common Stock, Voting Rights	ten
Restricted Stock Units (RSUs) [Member]
Class of Stock [Line Items]
Restricted stock units outstanding (shares)	8,727,000	8,714,000
Performance Shares [Member]
Class of Stock [Line Items]
Restricted stock units outstanding (shares)	686,000	1,134,000
Performance stock units outstanding (shares)	942,000
Common Stock
Class of Stock [Line Items]
Common stock available for future grants (shares)	38,845,000