EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income (Numerator)
Income from continuing operations	$ 30,199	$ 18,559	$ 59,340	$ 33,793
Income impact of assumed conversion of the 4.875% Notes, net of taxes	45	42	90	83
Net (income) loss attributable to noncontrolling interests included in continuing operations	(72)	102	213	254
Numerator for diluted earnings per common share from continuing operations available to common shareholders	30,172	18,703	59,643	34,130
Loss from discontinued operations	(67)	(82)	(134)	(189)
Numerator for diluted earnings available to common shareholders	$ 30,105	$ 18,621	$ 59,509	$ 33,941
Shares (Denominator)
Weighted-average common shares outstanding	81,036,000	80,734,000	80,944,000	80,551,000
Dilutive effect of stock settled appreciation rights, restricted stock awards and outstanding stock options (in shares)	4,000	40,000	13,000	55,000
Dilutive effect of 4.875% Notes (in shares)	254,000	254,000	254,000	254,000
Weighted-average common and common equivalent shares outstanding	81,294,000	81,028,000	81,211,000	80,860,000
Additional Disclosures
Antidilutive dilutive securities excluded from calculation of diluted earnings per share (in shares)	1,500,000	1,100,000	1,500,000	1,100,000
4.875% Notes
Earning Per Share
Interest rate (as a percent)	4.875%		4.875%