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Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance at the beginning of the period | $ 39,664 | $ 31,735
Net income during the period | 26,647 | 6,929
Treasury stock purchased | (384) |
Exercise of stock options | 489 | 746
Balance at end of the period | $ 66,668 | $ 39,664

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