Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on offering date that participants pay for shares.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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 shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Stock Compensation - Narratives (Details) - USD ($)		1 Months Ended	12 Months Ended			24 Months Ended
Stock Compensation - Narratives (Details) - USD ($)	Jun. 30, 2018	Feb. 28, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation			$ 13,300,000	$ 15,100,000	$ 19,800,000
Tax benefit from stock option exercise					$ 12,700,000
Stock compensation not yet recognized			$ 24,200,000
Recognition period for stock compensation not yet recognized, years			2 years
Stock Incentive Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award
Stock incentive plan, shares authorized							2,761,000
Stock Incentive Plan \| Class B-1 Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Stock incentive plan, shares authorized							4,732,200
Omnibus Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award
Stock incentive plan, shares authorized			7,500,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Stock compensation expiration period, years			10 years
Stock options \| Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares issued for exercise/vesting of share-based compensation awards, shares						5,156,976
RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Equity instruments granted, shares			952,801	766,927	365,972
Forfeited, shares			154,498	530,867	13,714
RSUs \| Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares issued for exercise/vesting of share-based compensation awards, shares						385,220
Domestic Tax Authority
Share-based Compensation Arrangement by Share-based Payment Award
Tax benefit from stock option exercise					$ 14,100,000
Foreign Tax Authority
Share-based Compensation Arrangement by Share-based Payment Award
Tax benefit from stock option exercise			$ 0	$ 0	$ 1,400,000
Minimum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Stock compensation vesting period, years			3 years
Minimum \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Stock compensation vesting period, years			12 months
Maximum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Stock compensation vesting period, years			5 years
Maximum \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Stock compensation vesting period, years			60 months
Board of Directors Chairman \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Equity instruments granted, shares		314,267
Forfeited, shares	208,364
Measurement Input, Discount Rate \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Discount from market price, offering date, percentage			10.00%