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Stockholders' Equity Stockholders' Equity (Outstanding stock options) (Details)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Range Of Exercise Prices, $4.78-5.94
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in usd per share)	$ 4.78
Number of outstanding options at end of year (in shares) | shares	13,333
Weighted-average remaining contractual life, options outstanding	3 years 5 months 23 days
Weighted average exercise price, options outstanding (in usd per share)	$ 18.02
Number of exercisable options at end of year (in shares) | shares	0
Weighted average exercise price, options exercisable (in usd per share)	$ 0
Exercise price range, upper range limit (in usd per share)	5.94
Range Of Exercise Prices, $16.73-17.21
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in usd per share)	$ 16.73
Number of outstanding options at end of year (in shares) | shares	464,921
Weighted-average remaining contractual life, options outstanding	5 years 2 months 4 days
Weighted average exercise price, options outstanding (in usd per share)	$ 24.80
Number of exercisable options at end of year (in shares) | shares	375,793,000
Weighted average exercise price, options exercisable (in usd per share)	$ 24.51
Exercise price range, upper range limit (in usd per share)	$ 20.49
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Remaining Contractual Term	5 years 25 days
Range of Exercise Prices, $18.86-20.49
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in usd per share)	$ 22.58
Number of outstanding options at end of year (in shares) | shares	786,900
Weighted-average remaining contractual life, options outstanding	9 years 1 month 20 days
Weighted average exercise price, options outstanding (in usd per share)	$ 34.79
Number of exercisable options at end of year (in shares) | shares	50,000,000
Weighted average exercise price, options exercisable (in usd per share)	$ 34.79
Exercise price range, upper range limit (in usd per share)	$ 26.93
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Remaining Contractual Term	9 years 1 month 20 days
Range of Exercise Prices, $4.78-20.49
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in usd per share)	$ 4.78
Number of outstanding options at end of year (in shares) | shares	1,265,154
Weighted-average remaining contractual life, options outstanding	7 years 7 months 17 days
Weighted average exercise price, options outstanding (in usd per share)	$ 30.94
Number of exercisable options at end of year (in shares) | shares	425,793,000
Weighted average exercise price, options exercisable (in usd per share)	$ 25.71
Exercise price range, upper range limit (in usd per share)	$ 26.93
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Remaining Contractual Term	5 years 6 months 18 days

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