EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income (Numerator)
Net Income	$ 50,600	$ 46,399	$ 76,229	$ 71,235
Net (income) loss attributable to noncontrolling interests	(1,181)	(612)	(2,670)	(1,166)
Numerator for diluted earnings per common share available to common shareholders	$ 49,419	$ 45,787	$ 73,559	$ 70,069
Shares (Denominator)
Weighted-average common shares outstanding (shares)	95,026,000	95,307,000	94,922,000	95,219,000
Dilutive effect of stock-settled appreciation rights, restricted stock awards and outstanding stock options (shares)	908,000	743,000	897,000	692,000
Weighted-average common and common equivalent shares outstanding (shares)	95,934,000	96,050,000	95,819,000	95,911,000
Additional Disclosures
Potentially antidilutive dilutive securities excluded from calculation of diluted earnings per share (shares)	525,000	0	525,000	0