EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income (loss) (Numerator)
Income from continuing operations	$ 16,515	$ 29,125
Net loss attributable to noncontrolling interests included in continuing operations	127	285
Numerator for diluted earnings per common share from continuing operations available to common shareholders	16,713	29,455
Income (loss) from discontinued operations, net of taxes	355	(51)
Numerator for diluted earnings available to common shareholders	17,068	29,404
Shares (Denominator)
Weighted average common shares outstanding (in shares)	81,191,000	80,852,000
Dilutive effect of stock-settled appreciation rights, restricted stock awards and outstanding stock options (in shares)	223,000	21,000
Weighted-average common and common equivalent shares outstanding (in shares)	82,064,000	81,127,000
Additional Disclosures
Antidilutive dilutive securities excluded from calculation of diluted earnings per share (in shares)	1,600,000	1,500,000
4.875% Notes
Earning Per Share
Interest rate (as a percent)	4.875%
Income (loss) (Numerator)
Income impact of assumed conversion of debt securities, net of taxes	45	45
Shares (Denominator)
Dilutive effect of debt securities (in shares)	339,000	254,000
3.0% Notes
Earning Per Share
Interest rate (as a percent)	3.00%
Income (loss) (Numerator)
Income impact of assumed conversion of debt securities, net of taxes	$ 26
Shares (Denominator)
Dilutive effect of debt securities (in shares)	311,000