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Stockholders' Equity Stockholders' Equity (Outstanding stock options) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Range Of Exercise Prices, $4.78-5.94
Share-based Compensation, Shares Authorized under Stock Option Plans, 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	105,603
Weighted-average remaining contractual life, options outstanding	2 years 6 months
Weighted average exercise price, options outstanding (in usd per share)	$ 5.66
Number of exercisable options at end of year (in shares) | shares	105,603
Weighted average exercise price, options exercisable (in usd per share)	$ 5.66
Range Of Exercise Prices, $16.73-17.21
Share-based Compensation, Shares Authorized under Stock Option Plans, 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	468,427
Weighted-average remaining contractual life, options outstanding	2 years 5 months 16 days
Weighted average exercise price, options outstanding (in usd per share)	$ 20.29
Number of exercisable options at end of year (in shares) | shares	382,627
Weighted average exercise price, options exercisable (in usd per share)	$ 20.34
Range of Exercise Prices, $18.86-20.49
Share-based Compensation, Shares Authorized under Stock Option Plans, 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	949,100
Weighted-average remaining contractual life, options outstanding	6 years 1 month 10 days
Weighted average exercise price, options outstanding (in usd per share)	$ 24.58
Number of exercisable options at end of year (in shares) | shares	513,040
Weighted average exercise price, options exercisable (in usd per share)	$ 23.26
Range of Exercise Prices, $4.78-20.49
Share-based Compensation, Shares Authorized under Stock Option Plans, 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	1,523,130
Weighted-average remaining contractual life, options outstanding	4 years 8 months 27 days
Weighted average exercise price, options outstanding (in usd per share)	$ 20.85
Number of exercisable options at end of year (in shares) | shares	1,001,270
Weighted average exercise price, options exercisable (in usd per share)	$ 20.29

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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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