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Stockholders' Equity Stockholders' Equity (Outstanding stock options) (Details)	12 Months Ended
	Dec. 31, 2019 $ / 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
Exercise price range, upper range limit (in usd per share)	$ 5.94
Number of outstanding options at end of year (in shares) | shares	43,871
Weighted-average remaining contractual life, options outstanding	1 year 8 months 9 days
Weighted average exercise price, options outstanding (in usd per share)	$ 5.82
Number of exercisable options at end of year (in shares) | shares	43,871,000
Weighted average exercise price, options exercisable (in usd per share)	$ 5.82
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
Exercise price range, upper range limit (in usd per share)	$ 20.49
Number of outstanding options at end of year (in shares) | shares	495,320
Weighted-average remaining contractual life, options outstanding	3 years 3 months
Weighted average exercise price, options outstanding (in usd per share)	$ 21.89
Number of exercisable options at end of year (in shares) | shares	84,240,000
Weighted average exercise price, options exercisable (in usd per share)	$ 20.06
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
Exercise price range, upper range limit (in usd per share)	$ 26.93
Number of outstanding options at end of year (in shares) | shares	538,944
Weighted-average remaining contractual life, options outstanding	7 years 11 months 12 days
Weighted average exercise price, options outstanding (in usd per share)	$ 25.86
Number of exercisable options at end of year (in shares) | shares	514,612,000
Weighted average exercise price, options exercisable (in usd per share)	$ 23.72
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
Exercise price range, upper range limit (in usd per share)	$ 26.93
Number of outstanding options at end of year (in shares) | shares	1,078,135
Weighted-average remaining contractual life, options outstanding	5 years 6 months 15 days
Weighted average exercise price, options outstanding (in usd per share)	$ 23.22
Number of exercisable options at end of year (in shares) | shares	642,723,000
Weighted average exercise price, options exercisable (in usd per share)	$ 22.02

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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