STOCK PLANS (Textual) (Details) (USD $)	12 Months Ended																	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock options	Dec. 31, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 31, 2013 Restricted stock awards	Dec. 31, 2012 Restricted stock awards	Dec. 31, 2011 Restricted stock awards	Dec. 31, 2013 Restricted Stock Units	Dec. 31, 2012 Restricted Stock Units	Dec. 31, 2011 Restricted Stock Units	Dec. 31, 2013 1995 Lincoln Stock Purchase Plan	Dec. 31, 2012 1995 Lincoln Stock Purchase Plan	Dec. 31, 2011 1995 Lincoln Stock Purchase Plan	Apr. 28, 2006 EPI Plan	Apr. 28, 2006 Director Plan	Dec. 31, 2013 2005 Plan Restricted Stock Units	Dec. 31, 2013 Minimum Restricted stock awards	Dec. 31, 2013 Minimum Restricted Stock Units	Dec. 31, 2013 Maximum Restricted stock awards	Dec. 31, 2013 Maximum Restricted Stock Units	Dec. 31, 2013 Maximum 1995 Lincoln Stock Purchase Plan
Stock Plans
Maximum additional number of the Company's common shares that may be granted (in shares)													800,000			6,000,000	600,000
Common shares available for future grant under all plans (in shares)	2,315,239
Award expiration (in years)				10 years
Award vesting period (in years)				3 years															3 years	3 years	5 years	5 years
Aggregate intrinsic value of awards outstanding				$ 85,404,000
Aggregate intrinsic value of awards exercisable				76,076,000
Total intrinsic value of awards exercised				20,297,000	18,776,000	10,028,000
Shares converted (in shares)							205,301			33,698	10,499	0						31,552
Deferred RSUs (in shares)																		43,012
Shares granted (in shares)							14,464	20,099	22,779	69,925	133,944	166,519
Shares granted (in dollars per share)							$ 70.88	$ 47.81	$ 35.55	$ 67.17	$ 47.97	$ 34.55
Remaining weighted average life of non-vested restricted awards (in years)							1 year 9 months 18 days			4 years 1 month 6 days
Total stock-based compensation expense	9,734,000	8,961,000	6,610,000
Tax benefit related to stock-based compensation recognized in the period	3,727,000	3,409,000	2,515,000
Total unrecognized stock-based compensation expense related to nonvested stock options, restricted shares and restricted stock units	21,633,000
Weighted average period of recognition of unrecognized stock-based compensation expense (in months)	3 years 4 months
Dollar value of shares that each employee has the ability to purchase on the open market, on a commission-free basis annually under the plan																							$ 10,000
Shares purchased (in shares)													4,653	4,908	4,466