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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 16,367	$ 12,656
Loss from discontinued operations	(633)	(452)
Net earnings available to common stockholders	$ 15,734	$ 12,204
Weighted average common shares outstanding (in shares)	22,846,595	22,642,312
Earnings from continuing operations per common share (in dollars per share)	$ 0.72	$ 0.56
Loss from discontinued operations per common share (in dollars per share)	(0.03)	(0.02)
Net earnings per common share - Basic (in dollars per share)	$ 0.69	$ 0.54
Diluted Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 16,367	$ 12,656
Loss from discontinued operations	(633)	(452)
Net earnings available to common stockholders	$ 15,734	$ 12,204
Weighted average common shares outstanding (in shares)	22,846,595	22,642,312
Plus incremental shares from assumed conversions [Abstract]
Dilutive effect of restricted stock and performance stock (in shares)	467,000	303,000
Weighted average common shares outstanding - Diluted (in shares)	23,313,773	22,944,947
Earnings from continuing operations per common share (in dollars per share)	$ 0.70	$ 0.55
Loss from discontinued operations per common share (in dollars per share)	(0.03)	(0.02)
Net earnings per common share - Diluted (in dollars per share)	$ 0.67	$ 0.53
Restricted and Performance-Based Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	249,000	358,000

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X

- Details

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