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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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