EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings per share
Net income from continuing operations	$ 10,029	$ 4,397	$ 24,496	$ 9,109
Loss from discontinued operations before income taxes (including gain on disposal)		(8)	(261)	(8)
Gain on disposal			63
Income tax expense		(3)	376	(3)
Net loss from discontinued operations		(5)	(637)	(5)
Net income	$ 10,029	$ 4,392	$ 23,859	$ 9,104
Average number of common shares issued	23,825	21,929	23,438	18,784
Less: average number of treasury shares	1,614	1,728	1,653	1,750
Less: average number of unvested stock award shares	290	192	244	171
Average number of basic common shares outstanding	21,921	20,009	21,541	16,863
Average number of diluted common shares outstanding	22,031	20,105	21,635	16,915
Basic earnings per share:
Continuing operations (in dollars per share)	$ 0.46	$ 0.22	$ 1.14	$ 0.54
Discontinued operations (in dollars per share)			$ (0.03)
Total basic earnings per share (in dollars per share)	$ 0.46	$ 0.22	$ 1.11	$ 0.54
Diluted earnings per share:
Continuing operations (in dollars per share)	$ 0.46	$ 0.22	$ 1.13	$ 0.54
Discontinued operations (in dollars per share)			$ (0.03)
Total diluted earnings per share (in dollars per share)	$ 0.46	$ 0.22	$ 1.10	$ 0.54
Unvested stock award shares
Earnings per share
Plus: dilutive effect of share-based payment arrangements (in shares)	72	90	1	49
Stock options
Earnings per share
Plus: dilutive effect of share-based payment arrangements (in shares)	38	6	93	3