EQUITY AND SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended				3 Months Ended													35 Months Ended	3 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Minimum	Mar. 31, 2013 Maximum	Mar. 31, 2013 Black-Scholes	Mar. 31, 2012 Black-Scholes	Mar. 31, 2013 Black-Scholes Minimum	Mar. 31, 2012 Black-Scholes Minimum	Mar. 31, 2013 Black-Scholes Maximum	Mar. 31, 2012 Black-Scholes Maximum	Mar. 31, 2013 Binomial	Mar. 31, 2012 Binomial	Mar. 31, 2013 Binomial Minimum	Mar. 31, 2012 Binomial Minimum	Mar. 31, 2013 Binomial Maximum	Mar. 31, 2012 Binomial Maximum	Mar. 31, 2013 Stock Repurchase Programs	Mar. 31, 2012 May 2010 Stock Repurchase Program	Mar. 31, 2013 2012 Stock Repurchase Program	May 31, 2012 2012 Stock Repurchase Program Maximum	Mar. 31, 2013 Service-based Options	Mar. 31, 2013 Market-based Options item	Mar. 31, 2013 Ordinary performance grants	Mar. 31, 2013 Ordinary performance grants Minimum item	Mar. 31, 2013 Extraordinary performance grants	Mar. 31, 2013 Extraordinary performance grants Minimum item
Stock Repurchase Plan
Number of shares of common stock authorized to be purchased																					3,500,000
Number of shares of common stock purchased																		2,800,000	300,000	300,000
Average purchase price per share (in dollars per share)																		$ 41.76	$ 63.25	$ 82.58
Remaining number of shares available for repurchase under the plan																				3,200,000
Amount available to repurchase common stock under Luxembourg law (in dollars)																				$ 40,000,000
Capacity available to repurchase common stock under debt agreement (in dollars)																				0
EQUITY AND SHARE-BASED COMPENSATION
Share-based compensation expense (in dollars)	1,400,000	(200,000)
Reversal of share-based compensation expense (in dollars)		800,000
Vesting period																						4 years
Expiration term																						10 years
Outstanding (in shares)	3,071,859		3,058,309																			900,000	2,200,000
Number of components of an award																							2
Market-based options subject to ordinary performance achievement (as a percent)																								0.67		0.33
Percentage of compounded annual gain of stock price over exercise price required for the award to vest																									20.00%		25.00%
Vesting percentage for awards that vest upon achievement of certain criteria																							25.00%
Cumulative vesting percentage for awards that vest in equal annual installments																							75.00%
Number of equal annual installments for vesting of award																							3
Stock options granted (in shares)	30,000	200,000			100,000
Weighted average exercise price of stock options granted (in dollars per share)	$ 88.56	$ 63.32
Multiplier of stock price over exercise price as a condition for the award to vest																									2		3
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate, minimum (as a percent)						1.02%	1.16%					0.08%	0.09%
Risk-free interest rate, maximum (as a percent)						1.13%	1.17%					2.02%	2.04%
Expected stock price volatility, minimum (as a percent)						36.35%	34.62%					36.40%	34.50%
Expected stock price volatility, maximum (as a percent)						36.50%	34.65%					36.50%	34.60%
Expected option life						6 years 3 months	6 years 3 months
Contractual life												14 years	14 years
Fair value (in dollars per share)	$ 25.22	$ 17.23						$ 31.33	$ 22.74	$ 34.74	$ 22.80			$ 16.12	$ 11.65	$ 30.34	$ 17.27
Weighted-average fair value of stock options granted and total intrinsic value of stock options exercised
Weighted-average fair value at date of grant (in dollars per share)	$ 25.22	$ 17.23						$ 31.33	$ 22.74	$ 34.74	$ 22.80			$ 16.12	$ 11.65	$ 30.34	$ 17.27
Intrinsic value of options exercised (in dollars)	918,000	8,242,000
Fair value of options vested (in dollars)	838,000	275,000
Estimated forfeiture rate (as a percent)				1.00%	10.00%
Estimated unrecognized compensation costs (in dollars)	$ 4,200,000
Weighted-average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized	2 years 3 months 18 days