STOCKHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings per share
Net income from continuing operations	$ 9,329	$ 10,029	$ 7,986	$ 6,481	$ 7,558	$ 4,397	$ 1,877	$ 2,835	$ 33,825	$ 16,434	$ 13,615
(Loss) income from discontinued operations before income taxes (including gain on disposals $4,962)									(261)	4,684
Gain on disposal									63	4,962
Income tax expense									376	3,770
Net (loss) income from discontinued operations				(637)	919	(5)			(637)	914
Net income	$ 9,329	$ 10,029	$ 7,986	$ 5,844	$ 8,477	$ 4,392	$ 1,877	$ 2,835	$ 33,188	$ 17,348	$ 13,615
Average number of common shares issued									24,081	19,812	15,849
Less: average number of treasury shares									1,626	1,741	1,818
Less: average number of unvested stock award shares									254	186	169
Average number of basic common shares outstanding	24,165	21,921	21,742	20,955	20,930	20,009	16,580	13,943	22,201	17,885	13,862
Average number of diluted common shares outstanding	24,396	22,031	21,806	21,062	21,043	20,105	16,601	13,981	22,329	17,952	13,896
Basic and diluted earnings per share:
Continuing operations (in dollars per share)	$ 0.39	$ 0.46	$ 0.37	$ 0.31	$ 0.36	$ 0.22	$ 0.11	$ 0.20	$ 1.52	$ 0.92	$ 0.98
Discontinued operations (in dollars per share)				$ (0.03)	$ 0.04				$ (0.03)	$ 0.05
Unvested stock award shares
Earnings per share
Plus: dilutive effect of share-based payment arrangements (in shares)									41		25
Stock Options
Earnings per share
Plus: dilutive effect of share-based payment arrangements (in shares)									87	67	9