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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2014
Stockholders' Equity Note [Abstract] |
Rollforward of Common Stock Issued and Outstanding | The following table is a summary of changes in common shares issued and outstanding:
| Year ended December 31, | 2014 |  | 2013 |  | 2012 |
| (thousands of shares) |  |  |  |  |  |
| Issued and outstanding shares – January 1 | 43,646 |  |  | 45,542 |  |  | 51,543 |  |
| Repurchase of shares | (5,355 | ) |  | (2,451 | ) |  | (6,399 | ) |
| Exercise of options and issuance of restricted stock awards | 151 |  |  | 555 |  |  | 398 |  |
| Issued and outstanding shares – December 31 | 38,442 |  |  | 43,646 |  |  | 45,542 |  |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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