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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic Net Earnings Per Common Shares [Abstract]
Earnings from continuing operations	$ 12,656	$ 9,339
Loss from discontinued operation	(452)	(391)
Net earnings available to common stockholders	$ 12,204	$ 8,948
Weighted average common shares outstanding (in shares)	22,642,312	22,910,889
Earnings from continuing operations per common share (in dollars per share)	$ 0.56	$ 0.41
Loss from discontinued operations per common share (in dollars per share)	(0.02)	(0.02)
Net earnings per common share - Basic (in dollars per share)	$ 0.54	$ 0.39
Diluted Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 12,656	$ 9,339
Loss from discontinued operation	(452)	(391)
Net earnings available to common stockholders	$ 12,204	$ 8,948
Plus incremental shares from assumed conversions [Abstract]
Weighted average common shares outstanding (in shares)	22,642,312	22,910,889
Dilutive effect of restricted stock and performance stock (in shares)	303,000	323,000
Dilutive effect of stock options (in shares)	0	4,000
Weighted average common shares outstanding - Diluted (in shares)	22,944,947	23,238,050
Earnings from continuing operations per common share (in dollars per share)	$ 0.55	$ 0.40
Loss from discontinued operations per common share (in dollars per share)	(0.02)	(0.01)
Net earnings per common share - Diluted (in dollars per share)	$ 0.53	$ 0.39
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)	0	3,000
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)	358,000	358,000

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