The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Retirement and Share-based Compensation Plans (Schedule of Stock Options Outstanding, By Exercise Price Range) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options outstanding, number of awards	2,918,946	3,443,991	4,044,175	3,976,725
Stock options outstanding, weighted-average exercise price per share	$ 16.06	$ 15.17	$ 15.02	$ 10.86
Exercise Price Range I [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	5.07
Exercise price range, upper range limit	$ 8.02
Stock options outstanding, number of awards	248,225
Stock options outstanding, remaining life (yrs)	1 year 8 months 27 days
Stock options outstanding, weighted-average exercise price per share	$ 7.16
Stock options vested, number of awards	248,225
Stock options vested, remaining life (yrs)	1 year 8 months 27 days
Stock options vested, weighted-average exercise price per share	$ 7.16
Exercise Price Range II [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	9.27
Exercise price range, upper range limit	$ 11.35
Stock options outstanding, number of awards	752,150
Stock options outstanding, remaining life (yrs)	2 years 7 months 29 days
Stock options outstanding, weighted-average exercise price per share	$ 10.19
Stock options vested, number of awards	752,150
Stock options vested, remaining life (yrs)	2 years 7 months 29 days
Stock options vested, weighted-average exercise price per share	$ 10.19
Exercise Price Range III [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	12.04
Exercise price range, upper range limit	$ 24.79
Stock options outstanding, number of awards	1,918,571
Stock options outstanding, remaining life (yrs)	3 years 2 months 28 days
Stock options outstanding, weighted-average exercise price per share	$ 19.52
Stock options vested, number of awards	1,918,571
Stock options vested, remaining life (yrs)	3 years 2 months 28 days
Stock options vested, weighted-average exercise price per share	$ 19.52
Exercise Price Range, All Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	5.07
Exercise price range, upper range limit	$ 24.79
Stock options outstanding, number of awards	2,918,946
Stock options outstanding, remaining life (yrs)	2 years 11 months 20 days
Stock options outstanding, weighted-average exercise price per share	$ 16.06
Stock options vested, number of awards	2,918,946
Stock options vested, remaining life (yrs)	2 years 11 months 20 days
Stock options vested, weighted-average exercise price per share	$ 16.06