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Stockholders' Equity Stockholders' Equity (Outstanding stock options) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / 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	$ 4.78
Exercise price range, upper range limit	$ 5.94
Number of outstanding options at end of year | shares	105,603
Weighted-average remaining contractual life, options outstanding	4 years 6 months
Weighted average exercise price, options outstanding	$ 5.66
Number of exercisable options at end of year | shares	105,603
Weighted average exercise price, options exercisable	$ 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	16.73
Exercise price range, upper range limit	$ 20.06
Number of outstanding options at end of year | shares	569,400
Weighted-average remaining contractual life, options outstanding	5 years 3 months 18 days
Weighted average exercise price, options outstanding	$ 17.84
Number of exercisable options at end of year | shares	380,000
Weighted average exercise price, options exercisable	$ 16.73
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	20.26
Exercise price range, upper range limit	$ 22.58
Number of outstanding options at end of year | shares	974,943
Weighted-average remaining contractual life, options outstanding	3 years 7 months 6 days
Weighted average exercise price, options outstanding	$ 21.43
Number of exercisable options at end of year | shares	620,877
Weighted average exercise price, options exercisable	$ 21.26
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	4.78
Exercise price range, upper range limit	$ 22.58
Number of outstanding options at end of year | shares	1,649,946
Weighted-average remaining contractual life, options outstanding	4 years 10 months 19 days
Weighted average exercise price, options outstanding	$ 19.18
Number of exercisable options at end of year | shares	1,106,480
Weighted average exercise price, options exercisable	$ 18.21

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The ceiling 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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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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-Publisher FASB
-Name Accounting Standards Codification
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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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