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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 |  |  |

X
- 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 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. + 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 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 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -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 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 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. + 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 + Details
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