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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Numerator and Denominator for Basic and Diluted Earnings Per Share |
Year ended December 31, |  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 70,629 |  |  | $ | 40,015 |  |  | $ | 28,255 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - Basic |  |  | 19,160,849 |  |  |  | 18,919,489 |  |  |  | 19,032,557 |
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans |  |  | 474,392 |  |  |  | 232,909 |  |  |  | 266,636 |
Weighted average number of common shares outstanding - Diluted |  |  | 19,635,241 |  |  |  | 19,152,398 |  |  |  | 19,299,193 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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