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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Basic Net Earnings Per Common Shares [Abstract] |  |  |  |
Earnings from continuing operations | $ 13,721 | $ 13,693 | $ 19,215 | $ 20,704
Loss from discontinued operations | (317) | (355) | (617) | (659)
Net earnings available to common stockholders | 13,404 | 13,338 | 18,598 | 20,045
Weighted average common shares outstanding (in shares) | 22,872,618 | 22,867,323 | 22,870,069 | 22,787,337
Net earnings from continuing operations per common share (in dollars per share) | $ 0.60 | $ 0.60 | $ 0.84 | $ 0.91
Loss from discontinued operations per common share (in dollars per share) | $ (0.01) | $ (0.02) | $ (0.03) | $ (0.03)
Net earnings per common share - Basic (in dollars per share) | $ 0.59 | $ 0.58 | $ 0.81 | $ 0.88
Diluted Net Earnings Per Common Share [Abstract] |  |  |  |
Earnings from continuing operations | 13,721 | 13,693 | 19,215 | 20,704
Interest income on debenture conversions (net of income tax expense) | 0 | 40 | 0 | 317
Earnings from continuing operations plus assumed conversions | 13,721 | 13,733 | 19,215 | 21,021
Loss from discontinued operation | (317) | (355) | (617) | (659)
Net earnings available to common stockholders plus assumed conversions | $ 13,404 | $ 13,378 | $ 18,598 | $ 20,362
Weighted average common shares outstanding (in shares) | 22,872,618 | 22,867,323 | 22,870,069 | 22,787,337
Plus incremental shares from assumed conversions [Abstract] |  |  |  |
Dilutive effect of restricted stock and performance stock (in shares) | 229,000 | 189,000 | 234,000 | 167,000
Dilutive effect of stock options (in shares) | 3,000 | 14,000 | 8,000 | 13,000
Dilutive effect of convertible debentures (in shares) | 0 | 126,000 | 0 | 471,000
Weighted average common shares outstanding - Diluted (in shares) | 23,104,654 | 23,196,125 | 23,111,732 | 23,438,247
Diluted Earning per share [Abstract] |  |  |  |
Net earnings from continuing operations per common share (in dollars per share) | $ 0.59 | $ 0.59 | $ 0.83 | $ 0.90
Loss from discontinued operations per common share (in dollars per share) | $ (0.01) | $ (0.01) | $ (0.03) | $ (0.03)
Net earnings per common share - Diluted (in dollars per share) | $ 0.58 | $ 0.58 | $ 0.80 | $ 0.87
Stock options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 29,000 | 235,000 | 25,000 | 236,000
Restricted and performance shares [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 216,000 | 153,000 | 213,000 | 159,000

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