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Retirement and Share-based Compensation Plans (Schedule of Stock Options Outstanding, By Exercise Price Range) (Details) (USD $) |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Exercise Price Range I [Member] | Dec. 31, 2013 Exercise Price Range II [Member] | Dec. 31, 2013 Exercise Price Range III [Member] | Dec. 31, 2013 Exercise Price Range, All Options [Member] | Dec. 31, 2013 Stock Options Outstanding [Member] Exercise Price Range I [Member] | Dec. 31, 2013 Stock Options Outstanding [Member] Exercise Price Range II [Member] | Dec. 31, 2013 Stock Options Outstanding [Member] Exercise Price Range III [Member] | Dec. 31, 2013 Stock Options Outstanding [Member] Exercise Price Range, All Options [Member] | Dec. 31, 2013 Stock Options Vested [Member] Exercise Price Range I [Member] | Dec. 31, 2013 Stock Options Vested [Member] Exercise Price Range II [Member] | Dec. 31, 2013 Stock Options Vested [Member] Exercise Price Range III [Member] | Dec. 31, 2013 Stock Options Vested [Member] 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 | $ 9.27 | $ 11.87 | $ 5.07 |  |  |  |  |  |  |  |
Exercise price range, upper range limit |  |  |  |  | $ 9.16 | $ 11.35 | $ 14.62 | $ 14.62 |  |  |  |  |  |  |  |
Number of awards |  |  |  |  |  |  |  |  | 756,550 | 1,681,475 | 1,538,700 | 3,976,725 | 756,550 | 1,592,475 | 1,433,700 | 3,782,725
Remaining life (yrs) |  |  |  |  |  |  |  |  | 3 years 2 months 3 days | 5 years 15 days | 5 years 3 months 16 days | 4 years 9 months 12 days | 3 years 2 months 3 days | 4 years 10 months 6 days | 5 years 1 month 9 days | 4 years 7 months 11 days
Weighted-average exercise price per share | $ 10.86 | $ 10.35 | $ 10.13 | $ 8.78 |  |  |  |  | $ 7.48 | $ 10.33 | $ 13.10 | $ 10.86 | $ 7.48 | $ 10.31 | $ 13.16 | $ 10.83

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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 + Details
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- Definition 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 -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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