EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended		9 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	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
EARNINGS PER SHARE
Net (loss) income from continuing operations applicable to common shareholders	$ 2,806	$ 1,950	$ (1,430)	$ (6,346)	$ 15,095	$ 17,552	$ 11,479	$ 1,753	$ (7,776)	$ 13,232	$ (5,826)	$ 30,784	$ (3,020)	$ 45,879	$ 48,259
Loss from discontinued operations, net of income taxes	(6,235)	(10,751)	4,661	(3,621)	(3,063)	(2,034)	(282)	11	1,040	(271)	(9,711)	(2,305)	(15,946)	(5,368)	(235)
Net (loss) income applicable to common shareholders	$ (3,429)	$ (8,801)	$ 3,231	$ (9,967)	$ 12,032	$ 15,518	$ 11,197	$ 1,764	$ (6,736)	$ 12,961	$ (15,537)	$ 28,479	$ (18,966)	$ 40,511	$ 48,024
Shares of common stock outstanding used to compute basic per common share amounts	35,397,195	35,388,862	35,377,939	35,056,902	34,945,120	34,927,373	34,872,430	34,570,836	35,209,849	34,710,269	35,275,046	34,782,207	35,309,478	34,825,867	34,273,621
Effect of dilutive restricted stock units and options (in shares)														382,887	463,799
Shares used to compute dilutive per common share amounts	35,615,092	35,571,188	35,377,939	35,056,902	35,364,729	35,298,046	35,211,878	35,062,115	35,209,849	35,124,223	35,275,046	35,180,990	35,309,478	35,208,754	34,737,420
Basic
(Loss) income from continuing operations per share applicable to common shareholders (in dollars per shares)	$ 0.08	$ 0.05	$ (0.04)	$ (0.18)	$ 0.43	$ 0.50	$ 0.33	$ 0.05	$ (0.22)	$ 0.38	$ (0.17)	$ 0.89	$ (0.09)	$ 1.32	$ 1.41
Loss from discontinued operations per share applicable to common shareholders (in dollars per share)	(0.18)	(0.30)	0.13	(0.10)	(0.09)	(0.06)	(0.01)		0.03	(0.01)	(0.27)	(0.07)	(0.45)	(0.16)	(0.01)
Basic (loss) income per share (in dollars per share)	(0.10)	(0.25)	0.09	(0.28)	0.34	0.44	0.32	0.05	(0.19)	0.37	(0.44)	0.82	(0.54)	1.16	1.40
Diluted
(Loss) income from continuing operations per share applicable to common shareholders (in dollars per shares)	0.08	0.05	(0.04)	(0.18)	0.43	0.50	0.33	0.05	(0.22)	0.38	(0.17)	0.88	(0.09)	1.30	1.39
Loss from discontinued operations per share applicable to common shareholders (in dollars per share)	(0.18)	(0.30)	0.13	(0.10)	(0.09)	(0.06)	(0.01)		0.03	(0.01)	(0.27)	(0.07)	(0.45)	(0.15)	(0.01)
Diluted (loss) income per share (in dollars per share)	$ (0.10)	$ (0.25)	$ 0.09	$ (0.28)	$ 0.34	$ 0.44	$ 0.32	$ 0.05	$ (0.19)	$ 0.37	$ (0.44)	$ 0.81	$ (0.54)	$ 1.15	$ 1.38