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Earnings Per Share | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Earnings Per Share | 22. Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share:
Year Ended December 31 |  | 2012 |  |  | 2011 |  |  | 2010 |
Numerator: |  |  |  |  |  |  |  |  |
Net income (in thousands) |  | $ | 44,862 |  |  | $ | 38,827 |  |  | $ | 33,034 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares |  |  | 15,466,274 |  |  |  | 15,313,081 |  |  |  | 15,233,858 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Dilutive effect of equity grants |  |  | 54,243 |  |  |  | 51,112 |  |  |  | 24,936 |
Adjusted weighted average shares |  |  | 15,520,517 |  |  |  | 15,364,193 |  |  |  | 15,258,794 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 2.90 |  |  | $ | 2.54 |  |  | $ | 2.17 |
Diluted earnings per share |  |  | 2.89 |  |  |  | 2.53 |  |  |  | 2.16 |
At December 31, 2012, 89,746 stock options at a weighted average price of $38.95 were outstanding and were not used in the computation of diluted earnings per share because their exercise price was greater than the average market value of the common stock. Unvested restricted stock grants were also used in the calculation of diluted earnings per share based on the treasury method. At December 31, 2011, 323,255 stock options at a price of $33.02 were outstanding and were not used in the computation of diluted earnings per share. At December 31, 2010, 422,972 stock options at a price of $32.36 were outstanding and were not used in the computation of diluted earnings per share.

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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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