EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income (Numerator)
Income from continuing operations	$ 60,830	$ 44,034	$ 46,399	$ 24,836	$ 97,089	$ 48,768	$ 41,601	$ 27,657	$ 176,099	$ 215,115	$ 64,259
Net income loss attributable to noncontrolling interests included in continuing operations									(4,575)	(2,836)	(2,349)
Numerator for diluted earnings per common share from continuing operations available to common shareholders									171,524	212,279	61,910
Income from discontinued operations, net of taxes									0	0	11,558
Numerator for diluted earnings available to common shareholders									$ 171,524	$ 212,279	$ 73,468
Shares (Denominator)
Weighted average common shares outstanding (in shares)									95,003,000	97,114,000	93,207,000
Dilutive effect of stock settled appreciation rights, restricted stock awards and outstanding stock options (in shares)									725,000	705,000	638,000
Weighted-average common and common equivalent shares outstanding (in shares)									95,728,000	97,819,000	93,845,000
Additional Disclosures
Antidilutive dilutive securities excluded from calculation of diluted earnings per share (in shares)									100,000	300,000	0