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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 22,654	$ 19,273	$ 56,313	$ 44,697
Loss from discontinued operations	(7,903)	(3,524)	(9,914)	(5,014)
Net earnings available to common stockholders	$ 14,751	$ 15,749	$ 46,399	$ 39,683
Weighted average common shares outstanding (in shares)	22,329,835	22,424,962	22,359,637	22,464,697
Earnings from continuing operations per common share (in dollars per share)	$ 1.01	$ 0.86	$ 2.52	$ 1.99
Loss from discontinued operations per common share (in dollars per share)	(0.35)	(0.16)	(0.44)	(0.22)
Net earnings per common share - Basic (in dollars per share)	$ 0.66	$ 0.70	$ 2.08	$ 1.77
Diluted Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 22,654	$ 19,273	$ 56,313	$ 44,697
Loss from discontinued operations	(7,903)	(3,524)	(9,914)	(5,014)
Net earnings available to common stockholders	$ 14,751	$ 15,749	$ 46,399	$ 39,683
Weighted average common shares outstanding (in shares)	22,329,835	22,424,962	22,359,637	22,464,697
Plus incremental shares from assumed conversions [Abstract]
Dilutive effect of restricted stock and performance-based stock (in shares)	424,000	514,000	454,000	490,000
Weighted average common shares outstanding - Diluted (in shares)	22,754,440	22,938,925	22,814,228	22,954,649
Earnings from continuing operations per common share (in dollars per share)	$ 1.00	$ 0.84	$ 2.47	$ 1.95
Loss from discontinued operations per common share (in dollars per share)	(0.35)	(0.15)	(0.44)	(0.22)
Net earnings per common share - Diluted (in dollars per share)	$ 0.65	$ 0.69	$ 2.03	$ 1.73
Restricted and Performance-Based Shares [Member]
Earnings Per Share[Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	269,000	210,000	260,000	246,000

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