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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Basic Net Earnings Per Common Shares [Abstract] |  |  |  |
Earnings from continuing operations | $ 17,686 | $ 17,444 | $ 43,652 | $ 36,659
Loss from discontinued operation | (389) | (604) | (1,138) | (1,221)
Net earnings available to common stockholders | 17,297 | 16,840 | 42,514 | 35,438
Weighted average common shares outstanding (in shares) | 22,999,832 | 22,691,878 | 22,945,424 | 22,810,238
Earnings from continuing operations per common share (in dollars per share) | $ 0.77 | $ 0.77 | $ 1.90 | $ 1.61
Loss from discontinued operations per common share (in dollars per share) | $ (0.02) | $ (0.03) | $ (0.05) | $ (0.06)
Net earnings per common share - Basic (in dollars per share) | $ 0.75 | $ 0.74 | $ 1.85 | $ 1.55
Diluted Net Earnings Per Common Share [Abstract] |  |  |  |
Earnings from continuing operations | 17,686 | 17,444 | 43,652 | 36,659
Loss from discontinued operation | (389) | (604) | (1,138) | (1,221)
Net earnings available to common stockholders | $ 17,297 | $ 16,840 | $ 42,514 | $ 35,438
Plus incremental shares from assumed conversions [Abstract] |  |  |  |
Dilutive effect of restricted stock and performance stock (in shares) | 232,000 | 182,000 | 226,000 | 182,000
Dilutive effect of stock options (in shares) | 7,000 | 4,000 | 8,000 | 7,000
Weighted average common shares outstanding - Diluted (in shares) | 23,239,009 | 22,877,635 | 23,179,187 | 22,999,244
Diluted Earning per share [Abstract] |  |  |  |
Net earnings from continuing operations per common share (in dollars per share) | $ 0.76 | $ 0.76 | $ 1.88 | $ 1.59
Loss from discontinued operations per common share (in dollars per share) | $ (0.02) | $ (0.02) | $ (0.05) | $ (0.05)
Net earnings per common share - Diluted (in dollars per share) | $ 0.74 | $ 0.74 | $ 1.83 | $ 1.54
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) | 11,000 | 26,000 | 9,000 | 23,000
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) | 217,000 | 227,000 | 231,000 | 233,000

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