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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2013
Stockholders' Equity Note [Abstract] |
Schedule of Shareholders' Equity | The following table summarizes the change in shareholders’ equity during the three and nine months ended September 30, 2013 and 2012, respectively:
| Three months ended September 30, |  | Nine months ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Balance at the beginning of the period | $ | 67,655 |  |  | $ | 40,892 |  |  | $ | 66,668 |  |  | $ | 39,664 |
Net income during the period | 1,663 |  |  | 1,004 |  |  | 3,438 |  |  | 2,132 |
Treasury stock purchased | (1,200 | ) |  | (292 | ) |  | (2,191 | ) |  | (384 | )
Share-based compensation | 79 |  |  | 65 |  |  | 205 |  |  | 176 |
Tax benefit - stock option exercises | 55 |  |  | — |  |  | 55 |  |  | — |
Exercise of stock options | 292 |  |  | 220 |  |  | 456 |  |  | 301 |
Unrealized gain or loss in investments | 54 |  |  | — |  |  | (33 | ) |  | — |
Balance at end of the period | $ | 68,598 |  |  | $ | 41,889 |  |  | $ | 68,598 |  |  | $ | 41,889 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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