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STOCKHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE (Details 6) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings per share
Net income from continuing operations	$ 11,398	$ 11,988	$ 11,464	$ (1,106)	$ 10,537	$ 8,104	$ 12,037	$ 10,465	$ 33,744	$ 41,143	$ 33,825
Loss from discontinued operations before income taxes (including gain on disposals $63 in 2012)											(261)
Gain on disposal											63
Income tax expense											376
Net loss from discontinued operations											(637)
Net income	$ 11,398	$ 11,988	$ 11,464	$ (1,106)	$ 10,537	$ 8,104	$ 12,037	$ 10,465	$ 33,744	$ 41,143	$ 33,188
Average number of common shares issued									26,525	26,525	24,081
Less: average number of treasury shares									1,386	1,424	1,626
Less: average number of unvested stock award shares									409	299	254
Average number of basic common shares outstanding	24,758	24,747	24,715	24,698	24,701	24,748	24,779	24,948	24,730	24,802	22,201
Average number of diluted common shares outstanding	24,912	24,861	24,809	24,698	24,857	24,873	24,956	25,143	24,854	24,965	22,329
Basic earnings per share:
Continuing Operations (in dollars per share)	$ 0.46	$ 0.48	$ 0.46	$ (0.04)	$ 0.43	$ 0.33	$ 0.49	$ 0.42	$ 1.36	$ 1.66	$ 1.52
Discontinued operations (in dollars per share)											$ (0.03)
Total basic earning per share (in dollars per share)	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ 0.43us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 1.36us-gaap_EarningsPerShareBasic	$ 1.66us-gaap_EarningsPerShareBasic	$ 1.49us-gaap_EarningsPerShareBasic
Diluted earnings per share:
Continuing Operations (in dollars per share)	$ 0.46	$ 0.48	$ 0.46	$ (0.04)	$ 0.42	$ 0.33	$ 0.48	$ 0.42	$ 1.36	$ 1.65	$ 1.52
Discontinued operations (in dollars per share)											$ (0.03)
Total diluted earnings per share (in dollars per share)	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 1.36us-gaap_EarningsPerShareDiluted	$ 1.65us-gaap_EarningsPerShareDiluted	$ 1.49us-gaap_EarningsPerShareDiluted
Unvested Stock Award shares
Earnings per share
Plus: dilutive effect of share-based payment arrangements (in shares)									67	60	41
Options
Earnings per share
Plus: dilutive effect of share-based payment arrangements (in shares)									57	103	87