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Earnings Per Share | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Earnings Per Share |
| 11. | Earnings Per Share
Set forth below is a reconciliation of the numerator and denominator for basic and diluted earnings per share calculations for the periods indicated:
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 |
The dilutive effect of outstanding options and restricted stock units is calculated using the treasury stock method. The weighted average number of common shares outstanding decreased from the previous year in 2011 and 2010 as a result of the Company's stock repurchase plans, which were authorized by the Board of Directors in 2008 and 2010. See Note 12 for further information. There are no anti-dilutive stock options in 2012, 2011, and 2010 because the closing price of the Company's stock on December 31, 2012, 2011, and 2010 exceeded the strike price of all outstanding options on that date.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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