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Shareholders' Equity and Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2013
Shareholders' Equity and Stock Options [Abstract] |
Summary of stock units and stock options outstanding under the Comprehensive Plan | As further described in the paragraphs below, outstanding stock units and stock options under the Comprehensive Plan were as follows:
|  | December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Common stock units related to deferred compensation for Directors |  | 118,062 |  |  | 111,928 |  |  | 113,502 |
Common stock units related to deferred compensation for employees |  | 111,981 |  |  | 116,174 |  |  | 115,087 |
Stock options |  | 956,814 |  |  | 1,882,939 |  |  | 2,600,583 |
Restricted common stock units related to incentive compensation |  | 1,663,190 |  |  | 1,423,611 |  |  | 1,135,840 |
Total |  | 2,850,047 |  |  | 3,534,652 |  |  | 3,965,012 |
Summary of changes in outstanding options | Changes in outstanding options were as follows:
| Weighted Average |  | Range of |  | Options |
| Option Price |  | Option Prices |  |  |  |  |  |  | Vested and |
| per Share |  | per Share |  | Outstanding |  | Exercisable |
December 31, 2012 |  |  | $ | 14.73 |  |  |  | $ 6.91-$20.23 |  |  |  |  | 1,882,939 |  |  |  |  | 1,161,703 |  |
Granted |  |  | $ | 20.97 |  |  |  | $20.60-$30.24 |  |  |  |  | 245,424 |  |  |  |  | - |  |
Vested |  |  | $ | 13.94 |  |  |  | $ 6.91-$20.60 |  |  |  |  | - |  |  |  |  | 324,291 |  |
Exercised |  |  | $ | 13.77 |  |  |  | $ 6.91-$20.23 |  |  |  |  | (1,158,537) |  |  |  |  | (1,158,537) |  |
Forfeited |  |  | $ | 17.02 |  |  |  | $13.83-$20.60 |  |  |  |  | (3,962) |  |  |  |  | (3,962) |  |
Expired |  |  | $ | 18.17 |  |  |  | $18.17 |  |  |  |  | (9,050) |  |  |  |  | (9,050) |  |
December 31, 2013 |  |  | $ | 17.49 |  |  |  | $ 6.91-$30.24 |  |  |  |  | 956,814 |  |  |  |  | 314,445 |  |
Summary of options outstanding segregated by ranges of exercise prices | Option information segregated by ranges of exercise prices was as follows:
| December 31, 2013 |
|  |  |  |  | Total Outstanding Options |  |  | Vested and Exercisable Options |
|  |  |  |  |  |  |  |  |  | Weighted |  |  | Weighted |  |  |  |  |  |  |  | Weighted |  |  | Weighted |
| Range of |  |  |  |  |  |  |  | Average |  |  | Average |  |  |  |  |  |  |  | Average |  |  | Average |
| Option Prices |  |  |  |  |  |  |  | Option Price |  |  | Remaining |  |  |  |  |  |  |  | Option Price |  |  | Remaining |
| per Share |  |  | Options |  |  |  | per Share |  |  | Term |  |  | Options |  |  |  | per Share |  |  | Term |
| $ 6.91-$13.83 |  |  |  | 178,858 |  |  | $ | 13.58 |  |  | 3.1 years |  |  |  | 119,543 |  |  | $ | 13.45 |  |  | 3.1 years |
| $16.81-$18.20 |  |  |  | 527,437 |  |  | $ | 17.17 |  |  | 4.6 years |  |  |  | 187,955 |  |  | $ | 17.10 |  |  | 4.2 years |
| $20.23-$30.24 |  |  |  | 250,519 |  |  | $ | 20.95 |  |  | 6.1 years |  |  |  | 6,947 |  |  | $ | 20.24 |  |  | 0.3 years |
Total | $ 6.91-$30.24 |  |  |  | 956,814 |  |  | $ | 17.49 |  |  | 4.7 years |  |  |  | 314,445 |  |  | $ | 15.78 |  |  | 3.7 years |
Summary of changes in outstanding restricted common stock units | Changes in outstanding restricted common stock units were as follows:
|  | Total Outstanding Units |  |  |  | Vested Units |
|  |  |  |  | Weighted Average |  |  |  |  |  |  |  |  |  | Weighted Average |
|  |  |  |  | Grant Date Fair |  |  |  |  |  |  |  |  |  | Grant Date Fair |
|  | Units |  | Value per Unit |  |  |  | Units |  |  |  | Value per Unit |
December 31, 2012 |  |  | 1,423,611 |  |  | $ | 15.93 |  |  |  |  |  | 311,407 |  |  |  |  |  | $ | 13.15 |  |
Granted (1) |  |  | 484,552 |  |  | $ | 25.13 |  |  |  |  |  | - |  |  |  |  |  |  | - |  |
Vested |  |  | - |  |  |  | - |  |  |  |  |  | 282,680 |  |  |  |  |  | $ | 13.50 |  |
Forfeited |  |  | (24,507) |  |  | $ | 15.62 |  |  |  |  |  | - |  |  |  |  |  |  | - |  |
Distributed (2) |  |  | (220,466) |  |  | $ | 9.87 |  |  |  |  |  | (220,466) |  |  |  |  |  | $ | 9.87 |  |
December 31, 2013 |  |  | 1,663,190 |  |  | $ | 19.41 |  |  |  |  |  | 373,621 |  |  |  |  |  | $ | 15.34 |  |
| (1) | Includes dividends reinvested into additional restricted common stock units.
| (2) | Includes distributed units which were utilized to satisfy withholding taxes due on the distribution.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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