EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Oct. 12, 2012
Income (Numerator)
Income from continuing operations	$ 26,576	$ 19,441	$ 85,772	$ 53,235
Income impact of assumed conversion of the 4.875% Notes, net of taxes	45	42	135	125
Net (income) loss attributable to noncontrolling interests included in continuing operations	(107)	(93)	106	161
Numerator for diluted earnings per common share from continuing operations available to common shareholders	26,514	19,390	86,013	53,521
Loss from discontinued operations	(224)	(110)	(214)	(300)
Numerator for diluted earnings available to common shareholders	$ 26,290	$ 19,280	$ 85,799	$ 53,221
Shares (Denominator)
Weighted average common shares outstanding (in shares)	81,081,000	80,764,000	80,990,000	80,623,000
Dilutive effect of stock settled appreciation rights, restricted stock awards and outstanding stock options (in shares)	44,000	50,000	23,000	53,000
Dilutive effect of 4.875% Notes (in shares)	254,000	254,000	254,000	254,000
Weighted-average common and common equivalent shares outstanding (in shares)	81,379,000	81,068,000	81,267,000	80,930,000
Additional Disclosures
Antidilutive dilutive securities excluded from calculation of diluted earnings per share (in shares)	1,400,000	1,100,000	1,500,000	1,100,000
Earning Per Share
Interest rate (as a percent)					6.125%
4.875% Notes
Earning Per Share
Interest rate (as a percent)	4.875%		4.875%