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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic Net Earnings Per Common Shares [Abstract]
Earnings from continuing operations	$ 12,407	$ 9,566
Loss from discontinued operation	(682)	(392)
Net earnings available to common stockholders	11,725	9,174
Weighted average common shares outstanding (in shares)	22,947,241	22,853,494
Earnings from continuing operations per common share (in dollars per share)	$ 0.54	$ 0.42
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)	$ 0.51	$ 0.40
Diluted Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	12,407	9,566
Loss from discontinued operation	(682)	(392)
Net earnings available to common stockholders	$ 11,725	$ 9,174
Plus incremental shares from assumed conversions [Abstract]
Dilutive effect of restricted stock and performance stock (in shares)	272,000	234,000
Dilutive effect of stock options (in shares)	6,000	8,000
Weighted average common shares outstanding - Diluted (in shares)	23,224,698	23,095,490
Earnings from continuing operations per common share (in dollars per share)	$ 0.53	$ 0.41
Loss from discontinued operations per common share (in dollars per share)	$ (0.03)	$ (0.01)
Net earnings per common share - Diluted (in dollars per share)	$ 0.50	$ 0.40
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)	6,000	14,000
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)	308,000	253,000

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