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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 19,273	$ 17,108	$ 44,697	$ 51,736
Loss from discontinued operations	(3,524)	(3,983)	(5,014)	(5,113)
Net earnings available to common stockholders	$ 15,749	$ 13,125	$ 39,683	$ 46,623
Weighted average common shares outstanding (in shares)	22,424,962	22,660,157	22,464,697	22,774,927
Earnings from continuing operations per common share (in dollars per share)	$ 0.86	$ 0.75	$ 1.99	$ 2.27
Loss from discontinued operations per common share (in dollars per share)	(0.16)	(0.17)	(0.22)	(0.22)
Net earnings per common share - Basic (in dollars per share)	$ 0.70	$ 0.58	$ 1.77	$ 2.05
Diluted Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 19,273	$ 17,108	$ 44,697	$ 51,736
Loss from discontinued operations	(3,524)	(3,983)	(5,014)	(5,113)
Net earnings available to common stockholders	$ 15,749	$ 13,125	$ 39,683	$ 46,623
Weighted average common shares outstanding (in shares)	22,424,962	22,660,157	22,464,697	22,774,927
Plus incremental shares from assumed conversions [Abstract]
Dilutive effect of restricted stock and performance-based stock (in shares)	514,000	515,000	490,000	512,000
Weighted average common shares outstanding - Diluted (in shares)	22,938,925	23,174,700	22,954,649	23,287,052
Earnings from continuing operations per common share (in dollars per share)	$ 0.84	$ 0.74	$ 1.95	$ 2.22
Loss from discontinued operations per common share (in dollars per share)	(0.15)	(0.17)	(0.22)	(0.22)
Net earnings per common share - Diluted (in dollars per share)	$ 0.69	$ 0.57	$ 1.73	$ 2.00
Restricted and Performance-Based Shares [Member]
Earnings Per Share, Diluted, Other Disclosures [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	210,000	218,000	246,000	232,000

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