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Share-Based Compensation - Stock option activity (Details) - Stock Options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Number of Options / SARs
Outstanding, beginning of year (in shares) | shares	18,853,018
Granted (in shares) | shares	1,121,833
Exercised (in shares) | shares	(1,981,216)
Forfeited or expired (in shares) | shares	(154,302)
Outstanding, end of year (in shares) | shares	17,839,333
Exercisable, end of year (in shares) | shares	15,132,810
Weighted Average Exercise Price
Outstanding, beginning of year, weighted average exercise price | $ / shares	$ 20.94
Granted, weighted average exercise price | $ / shares	42.34
Exercised, weighted average exercise price | $ / shares	10.92
Forfeited or expired, weighted average exercise price | $ / shares	30.13
Outstanding, end of year, weighted average exercise price | $ / shares	23.32
Exercisable, end of year, weighted average exercise price | $ / shares	$ 21.30
Weighted average contractual term, outstanding, end of year	4 years 8 months 26 days
Weighted average contractual term, exercisable, end of year	4 years 1 month 6 days
Aggregate intrinsic value, outstanding, end of year | $	$ 234,659
Aggregate intrinsic value, exercisable, end of year | $	$ 223,908

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Net number of share options (or share units) granted during the period.

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

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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