STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Awards granted
Shares	116,226
Restricted stock awards
Awards granted
Shares	47,507
Weighted-Average Grant-Date Fair Value (in dollars per share)	67.33
Performance stock awards
Awards granted
Performance Goals	3
Shares	68,719
Weighted-Average Grant-Date Fair Value (in dollars per share)	67.33