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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings (Loss) Per Share [Abstract] |
Earnings (loss) per share |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shares |  | $ | 11,505,000 |  |  | $ | 36,142,000 |  |  | $ | (14,611,000 | )
Weighted average common shares outstanding |  |  | 8,625,198 |  |  |  | 8,602,845 |  |  |  | 8,507,572 |
Basic earnings (loss) per common share |  | $ | 1.33 |  |  | $ | 4.20 |  |  | $ | (1.72 | )
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common shares |  | $ | 11,505,000 |  |  | $ | 36,142,000 |  |  | $ | (14,611,000 | )
Weighted average common shares outstanding for basic earnings (loss) per common share |  |  | 8,625,198 |  |  |  | 8,602,845 |  |  |  | 8,507,572 |
Add: Dilutive effects of share-based awards |  |  | 224,429 |  |  |  | 275,335 |  |  |  | 0 |
Average shares and dilutive potential common shares |  |  | 8,849,627 |  |  |  | 8,878,180 |  |  |  | 8,507,572 |
Diluted earnings (loss) per common share |  | $ | 1.30 |  |  | $ | 4.07 |  |  | $ | (1.72 | )

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