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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

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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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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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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

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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.

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Retirement and Share-based Compensation Plans (Schedule of Stock Options Outstanding, By Exercise Price Range) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options outstanding, number of awards	4,044,175	3,976,725	5,732,450	4,844,850
Stock options outstanding, weighted-average exercise price per share	$ 15.02	$ 10.86	$ 10.35	$ 10.13
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	506,000
Stock options outstanding, remaining life (yrs)	2 years 8 months 23 days
Stock options outstanding, weighted-average exercise price per share	$ 7.39
Stock options vested, number of awards	506,000
Stock options vested, remaining life (yrs)	2 years 8 months 23 days
Stock options vested, weighted-average exercise price per share	$ 7.39
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	1,220,550
Stock options outstanding, remaining life (yrs)	3 years 11 months 9 days
Stock options outstanding, weighted-average exercise price per share	$ 10.23
Stock options vested, number of awards	1,136,550
Stock options vested, remaining life (yrs)	3 years 8 months 9 days
Stock options vested, weighted-average exercise price per share	$ 10.21
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	$ 11.87
Exercise price range, upper range limit	$ 24.79
Stock options outstanding, number of awards	2,317,625
Stock options outstanding, remaining life (yrs)	5 years 2 months 24 days
Stock options outstanding, weighted-average exercise price per share	$ 19.22
Stock options vested, number of awards	2,297,625
Stock options vested, remaining life (yrs)	5 years 2 months 5 days
Stock options vested, weighted-average exercise price per share	$ 19.22
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	4,044,175
Stock options outstanding, remaining life (yrs)	4 years 6 months 12 days
Stock options outstanding, weighted-average exercise price per share	$ 15.02
Stock options vested, number of awards	3,940,175
Stock options vested, remaining life (yrs)	4 years 5 months 6 days
Stock options vested, weighted-average exercise price per share	$ 15.10