EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Basic earnings per share:
Net earnings from continuing operations	$ 3,447	$ 24,140	$ 4,396	$ 13,494					$ 45,477	$ 56,801	$ 50,704
Less: earnings allocated to unvested restricted stock									(1,096)	(1,845)	(2,072)
Net earnings from continuing operations allocated to common shares									44,381	54,956	48,632
Net loss from discontinued operations allocated to common shares									(348)
Net earnings allocated to common shares									44,033	54,956	48,632
Weighted-average basic shares and unvested restricted stock outstanding									42,506	37,370	37,142
Less: weighted-average unvested restricted stock outstanding (in shares)									(1,683)	(1,685)	(1,651)
Weighted-average basic shares outstanding									40,823	35,685	35,491
Net earnings from continuing operations (in dollars per share)	$ 0.07	$ 0.53	$ 0.11	$ 0.37					$ 1.09	$ 1.54	$ 1.37
Net loss from discontinuing operations (in dollars per share)									$ (0.01)
Net earnings (in dollars per share)	$ 0.06	$ 0.53	$ 0.11	$ 0.37	$ 0.54	$ 0.43	$ 0.42	$ 0.14	$ 1.08	$ 1.54	$ 1.37
Diluted earnings per share:
Net earnings from continuing operations allocated to common shares									44,381	54,956	48,632
Net loss from discontinued operations allocated to common shares									(348)
Net earnings allocated to common shares									$ 44,033	$ 54,956	$ 48,632
Weighted-average basic shares outstanding									40,823	35,685	35,491
Net earnings from continuing operations (in dollars per share)	$ 0.07	$ 0.53	$ 0.11	$ 0.37					$ 1.09	$ 1.54	$ 1.37
Net loss from discontinuing operations (in dollars per share)									$ (0.01)
Net earnings (in dollars per share)	$ 0.06	$ 0.53	$ 0.11	$ 0.37	$ 0.54	$ 0.43	$ 0.42	$ 0.14	$ 1.08	$ 1.54	$ 1.37