EARNINGS PER SHARE (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income (Numerator)
Income from continuing operations	$ 41,601	$ 12,956	$ 69,258	$ 29,471
Net (income) attributable to noncontrolling interests included in continuing operations	(266)	(233)	(765)	(106)
Numerator for diluted earnings per common share from continuing operations available to common shareholders	41,335	12,794	68,493	29,508
Income from discontinued operations, net of taxes		5,103		5,458
Numerator for diluted earnings available to common shareholders	41,335	17,897	68,493	34,966
Shares (Denominator)
Weighted average common shares outstanding	97,174	92,083	97,994	86,667
Dilutive effect of stock settled appreciation rights, restricted stock awards and outstanding stock options (in shares)	690	871	684	547
Weighted-average common and common equivalent shares outstanding	97,864	93,604	98,678	87,844
Additional Disclosures
Potentially antidilutive dilutive securities excluded from calculation of diluted earnings per share (in shares)	0	0	0	0
4.875% Notes
Earning Per Share
Interest rate (as a percent)	4.875%	4.875%	4.875%	4.875%
Income (Numerator)
Income impact of assumed conversion of debt securities, net of taxes		45		90
Shares (Denominator)
Dilutive effect of debt securities (in shares)		339		339
3.0% Notes
Earning Per Share
Interest rate (as a percent)	3.00%	3.00%	3.00%	3.00%
Income (Numerator)
Income impact of assumed conversion of debt securities, net of taxes		$ 26		$ 53
Shares (Denominator)
Dilutive effect of debt securities (in shares)		311		311