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Stockholders' Equity Stockholders' Equity (Outstanding stock options) (Details)	12 Months Ended
	Dec. 31, 2020 $ / 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	22,674
Weighted-average remaining contractual life, options outstanding	1 year 2 months 4 days
Weighted average exercise price, options outstanding (in usd per share)	$ 5.94
Number of exercisable options at end of year (in shares) | shares	22,674,000
Weighted average exercise price, options exercisable (in usd per share)	$ 5.94
Exercise price range, upper range limit (in usd per share)	$ 5.94
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Remaining Contractual Term	1 year 2 months 4 days
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	461,472
Weighted-average remaining contractual life, options outstanding	2 years 4 months 28 days
Weighted average exercise price, options outstanding (in usd per share)	$ 21.68
Number of exercisable options at end of year (in shares) | shares	415,432,000
Weighted average exercise price, options exercisable (in usd per share)	$ 21.96
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	2 years 1 month 20 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	427,590
Weighted-average remaining contractual life, options outstanding	6 years 6 months
Weighted average exercise price, options outstanding (in usd per share)	$ 26.19
Number of exercisable options at end of year (in shares) | shares	229,776,000
Weighted average exercise price, options exercisable (in usd per share)	$ 26.28
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	6 years 5 months 4 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	911,736
Weighted-average remaining contractual life, options outstanding	4 years 3 months 18 days
Weighted average exercise price, options outstanding (in usd per share)	$ 23.40
Number of exercisable options at end of year (in shares) | shares	667,882,000
Weighted average exercise price, options exercisable (in usd per share)	$ 22.90
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	3 years 6 months 29 days

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