EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic earnings per share:
Net earnings from continuing operations	$ 24,140	$ 4,396	$ 16,088	$ 42,030	$ 36,909
Less: earnings allocated to unvested restricted stock	(786)	(212)	(574)	(1,137)	(1,170)
Net earnings from continuing operations allocated to common shares	23,354	4,184	15,514	40,893	35,739
Net earnings (loss) from discontinued operations	23	(47)		(24)
Net earnings allocated to common shares	23,377	4,137	15,514	40,869	35,739
Weighted-average basic shares and unvested restricted stock outstanding	46,091	40,339	37,413	41,306	37,353
Less: weighted-average unvested restricted stock outstanding (in shares)	(1,795)	(1,597)	(1,713)	(1,663)	(1,679)
Weighted-average basic shares outstanding	44,296	38,742	35,700	39,643	35,674
Net earnings from continuing operations (in dollars per share)	$ 0.53	$ 0.11	$ 0.43	$ 1.03	$ 1.00
Net earnings (in dollars per share)	$ 0.53	$ 0.11	$ 0.43	$ 1.03	$ 1.00
Diluted earnings per share:
Net earnings from continuing operations allocated to common shares	23,354	4,184	15,514	40,893	35,739
Net earnings (loss) from discontinued operations	23	(47)		(24)
Net earnings allocated to common shares	$ 23,377	$ 4,137	$ 15,514	$ 40,869	$ 35,739
Weighted-average basic shares outstanding	44,296	38,742	35,700	39,643	35,674
Net earnings from continuing operations (in dollars per share)	$ 0.53	$ 0.11	$ 0.43	$ 1.03	$ 1.00
Net earnings (in dollars per share)	$ 0.53	$ 0.11	$ 0.43	$ 1.03	$ 1.00