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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Basic Net Earnings Per Common Share [Abstract] |  |  |  |
Earnings from continuing operations | $ 16,827 | $ 18,261 | $ 25,424 | $ 34,628
Loss from discontinued operations | (882) | (497) | (1,490) | (1,130)
Net earnings available to common stockholders | $ 15,945 | $ 17,764 | $ 23,934 | $ 33,498
Weighted average common shares outstanding (in shares) | 22,471,428 | 22,820,079 | 22,484,894 | 22,833,263
Earnings from continuing operations per common share (in dollars per share) | $ 0.75 | $ 0.80 | $ 1.13 | $ 1.52
Loss from discontinued operations per common share (in dollars per share) | (0.04) | (0.02) | (0.07) | (0.05)
Net earnings per common share - Basic (in dollars per share) | $ 0.71 | $ 0.78 | $ 1.06 | $ 1.47
Diluted Net Earnings Per Common Share [Abstract] |  |  |  |
Earnings from continuing operations | $ 16,827 | $ 18,261 | $ 25,424 | $ 34,628
Loss from discontinued operations | (882) | (497) | (1,490) | (1,130)
Net earnings available to common stockholders | $ 15,945 | $ 17,764 | $ 23,934 | $ 33,498
Weighted average common shares outstanding (in shares) | 22,471,428 | 22,820,079 | 22,484,894 | 22,833,263
Plus incremental shares from assumed conversions [Abstract] |  |  |  |
Dilutive effect of restricted stock and performance-based stock (in shares) | 487,000 | 509,000 | 477,000 | 499,000
Weighted average common shares outstanding - Diluted (in shares) | 22,958,469 | 23,329,082 | 22,962,049 | 23,332,480
Earnings from continuing operations per common share (in dollars per share) | $ 0.73 | $ 0.78 | $ 1.11 | $ 1.48
Loss from discontinued operations per common share (in dollars per share) | (0.04) | (0.02) | (0.07) | (0.04)
Net earnings per common share - Diluted (in dollars per share) | $ 0.69 | $ 0.76 | $ 1.04 | $ 1.44
Restricted and Performance-Based Shares [Member] |  |  |  |
Earnings Per Share, Diluted, Other Disclosures [Abstract] |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 251,000 | 228,000 | 265,000 | 240,000

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