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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
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, | 2015 |  | 2014 |  | 2013 |
| (thousands of shares) |  |  |  |  |  |
| Issued and outstanding shares – January 1 | 38,442 |  |  | 43,646 |  |  | 45,542 |  |
| Issuance of shares | 7,435 |  |  | — |  |  | — |  |
| Repurchase of shares | (2,473 | ) |  | (5,355 | ) |  | (2,451 | ) |
| Exercise of options and issuance of restricted stock awards | 297 |  |  | 151 |  |  | 555 |  |
| Issued and outstanding shares – December 31 | 43,701 |  |  | 38,442 |  |  | 43,646 |  |

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