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Stock-Based Compensation Plans (Summary of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Employee Stock Option Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Shares, Outstanding at Beginning of Year | 8,861 | 7,555 | 6,805
Shares, Granted | 2,731 | 2,641 | 2,462
Shares, Exercised | (2,225) | (689) | (1,497)
Shares, Forfeited | (367) | (646) | (215)
Shares, Outstanding at End of Year | 9,000 | 8,861 | 7,555
Shares, Exercisable at End of Year | 2,745 | 3,003 | 2,024
Wtd. Avg. Ex. Price, Outstanding at Beginning of Year (usd per share) | $ 21 | $ 21 | $ 17
Wtd. Avg. Ex. Price, Granted (usd per share) | $ 25 | $ 20 | $ 29
Wtd. Avg. Ex. Price, Exercised (usd per share) | $ 16 | $ 15 | $ 16
Wtd. Avg. Ex. Price, Forfeited (usd per share) | $ 23 | $ 21 | $ 19
Wtd. Avg. Ex. Price, Outstanding at End of Year (usd per share) | $ 23 | $ 21 | $ 21
Wtd. Avg. Ex. Price, Exercisable at End of Year (usd per share) | $ 23 | $ 19 | $ 17
Wtd. Avg. Remaining Contract Life, Outstanding at End of Year | 3 years 4 months 24 days | 3 years 4 months 24 days | 3 years 6 months
Wtd. Avg. Remaining Contract Life, Exercisable at End of Year | 2 years 3 months 18 days | 2 years 2 months 12 days | 2 years 3 months 18 days
Aggregate Intrinsic Value, Exercised | $ 20,884 | $ 3,810 | $ 20,659
Aggregate Intrinsic Value, Outstanding at End of Year | 85,633 | 11,730 | 66,295
Aggregate Intrinsic Value, Exercisable at End of Year | 28,302 | 7,617 | 26,218
Non-Employee Director Stock Option Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Shares, Outstanding at Beginning of Year | 234 | 192 | 244
Shares, Granted | 42 | 42 | 42
Shares, Exercised | (45) | 0 | (94)
Shares, Forfeited | 0 | 0 | 0
Shares, Outstanding at End of Year | 231 | 234 | 192
Shares, Exercisable at End of Year | 231 | 234 | 192
Wtd. Avg. Ex. Price, Outstanding at Beginning of Year (usd per share) | $ 21 | $ 21 | $ 18
Wtd. Avg. Ex. Price, Granted (usd per share) | $ 25 | $ 22 | $ 32
Wtd. Avg. Ex. Price, Exercised (usd per share) | $ 20 | $ 0 | $ 17
Wtd. Avg. Ex. Price, Forfeited (usd per share) | $ 0 | $ 0 | $ 0
Wtd. Avg. Ex. Price, Outstanding at End of Year (usd per share) | $ 22 | $ 21 | $ 21
Wtd. Avg. Ex. Price, Exercisable at End of Year (usd per share) | $ 22 | $ 21 | $ 21
Wtd. Avg. Remaining Contract Life, Outstanding at End of Year | 6 years 4 months 24 days | 6 years 4 months 24 days | 6 years 9 months 18 days
Wtd. Avg. Remaining Contract Life, Exercisable at End of Year | 6 years 4 months 24 days | 6 years 4 months 24 days | 6 years 9 months 18 days
Aggregate Intrinsic Value, Exercised | 300 |  | 1,362
Aggregate Intrinsic Value, Outstanding at End of Year | 2,491 | 225 | 1,740
Aggregate Intrinsic Value, Exercisable at End of Year | $ 2,491 | $ 225 | $ 1,740

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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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- 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 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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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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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- 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 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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