STOCK COMPENSATION PLANS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Stock-based Compensation Plans
Total compensation expense, before taxes	$ 13,900,000	$ 13,500,000	$ 12,700,000
Net tax benefit recognized in equity for stock compensation plans	6,513,000	5,522,000	462,000
Incentive shares available to be issued	3,715,327
Stock Options
Summary of Stock-based Compensation Plans
Cash proceeds from stock option exercises	4,900,000	1,700,000
Net tax benefit recognized in equity for stock compensation plans	$ 1,400,000	$ 48,000