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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings per Share | The following table reconciles the number of common shares used in calculating the basic and diluted net earnings per share:
|  | 2013 |  | 2012 |  | 2011
Basic average common shares outstanding 1 |  | 22,081,026 |  |  | 23,298,663 |  |  | 22,913,881 |
Incremental shares due to: |  |  |  |  |  |
Restricted stock units |  | 53,803 |  |  | 24,086 |  |  | 220,457 |
Performance shares |  | 129,003 |  |  | 291,036 |  |  | 817,946 |
Diluted average common shares outstanding |  | 22,263,832 |  |  | 23,613,785 |  |  | 23,952,284 |
Basic net earnings per common share |  | $ | 4.84 |  |  | $ | 2.75 |  |  | $ | 1.73 |
Diluted net earnings per common share |  | 4.80 |  |  | 2.72 |  |  | 1.66 |
Anti-dilutive shares excluded from calculation |  | 41,337 |  |  | 9,992 |  |  | 88,674 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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