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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 17,108	$ 21,055	$ 51,736	$ 53,573
Loss from discontinued operations	(3,983)	(425)	(5,113)	(1,495)
Net earnings available to common stockholders	$ 13,125	$ 20,630	$ 46,623	$ 52,078
Weighted average common shares outstanding (in shares)	22,660,157	22,716,279	22,774,927	22,688,071
Earnings from continuing operations per common share (in dollars per share)	$ 0.75	$ 0.93	$ 2.27	$ 2.36
Loss from discontinued operations per common share (in dollars per share)	(0.17)	(0.02)	(0.22)	(0.06)
Net earnings per common share - Basic (in dollars per share)	$ 0.58	$ 0.91	$ 2.05	$ 2.30
Diluted Net Earnings Per Common Share [Abstract]
Earnings from continuing operations	$ 17,108	$ 21,055	$ 51,736	$ 53,573
Loss from discontinued operations	(3,983)	(425)	(5,113)	(1,495)
Net earnings available to common stockholders	$ 13,125	$ 20,630	$ 46,623	$ 52,078
Weighted average common shares outstanding (in shares)	22,660,157	22,716,279	22,774,927	22,688,071
Plus incremental shares from assumed conversions [Abstract]
Dilutive effect of restricted stock and performance-based stock (in shares)	515,000	382,000	512,000	357,000
Weighted average common shares outstanding - Diluted (in shares)	23,174,700	23,097,699	23,287,052	23,044,604
Earnings from continuing operations per common share (in dollars per share)	$ 0.74	$ 0.91	$ 2.22	$ 2.32
Loss from discontinued operations per common share (in dollars per share)	(0.17)	(0.02)	(0.22)	(0.06)
Net earnings per common share - Diluted (in dollars per share)	$ 0.57	$ 0.89	$ 2.00	$ 2.26
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)	218,000	297,000	232,000	326,000

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