EQUITY AND SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended		6 Months Ended				6 Months Ended																3 Months Ended		6 Months Ended		50 Months Ended	0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Minimum	Jun. 30, 2014 Maximum	Jun. 30, 2013 Maximum	Jun. 30, 2014 Black-Scholes	Jun. 30, 2013 Black-Scholes	Jun. 30, 2013 Black-Scholes Minimum	Jun. 30, 2013 Black-Scholes Maximum	Jun. 30, 2013 Binomial	Jun. 30, 2013 Binomial Minimum	Jun. 30, 2013 Binomial Maximum	Jun. 30, 2014 Options Service-Based	Jun. 30, 2014 Options Service-Based Maximum	Jun. 30, 2014 Options Market-Based installment component	Jun. 30, 2014 Options Market-Based, ordinary performance	Jun. 30, 2014 Options Market-Based, ordinary performance Minimum	Jun. 30, 2014 Options Market-Based, extraordinary performance	Jun. 30, 2014 Options Market-Based, extraordinary performance Minimum	Jun. 30, 2014 Stock Repurchase Programs	Jun. 30, 2013 Stock Repurchase Programs	Jun. 30, 2014 Stock Repurchase Programs	Jun. 30, 2013 Stock Repurchase Programs	Jun. 30, 2014 Stock Repurchase Programs	Feb. 28, 2014 2014 Stock Repurchase Program
Stock Repurchase Plan
Number of shares of common stock authorized to be purchased																												3,400,000
Percentage of outstanding shares authorized to be repurchased																												15.00%
Minimum purchase price authorized (in dollars per share)																												$ 1.00
Maximum purchase price authorized (in dollars per share)																												$ 500.00
Number of shares of common stock purchased																							400,000	300,000	700,000	600,000	4,500,000
Average purchase price per share (in dollars per share)																							$ 108.24	$ 94.49	$ 109.00	$ 89.01	$ 70.62
Remaining number of shares available for repurchase under the plan																							2,900,000		2,900,000		2,900,000
Amount available to repurchase common stock under Luxembourg law (in dollars)																							$ 16,000,000		$ 16,000,000		$ 16,000,000
Capacity available to repurchase common stock under senior secured term loan (in dollars)																							88,000,000		88,000,000		88,000,000
STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION
Share-based compensation expense (in dollars)	400,000	100,000	1,100,000	1,500,000
Vesting period																4 years
Expiration term																	10 years
Outstanding (in shares)	2,543,777		2,543,777		2,589,343											700,000		1,800,000
Number of components of an award																		2
Market-based options subject to specified performance achievement (as a percent)																			0.67		0.33
Multiplier of stock price over exercise price as a condition for the award to vest																				2		3
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)			15,000				100,000	100,000
Weighted average exercise price of stock options granted (in dollars per share)			$ 105.11	$ 90.75
Assumptions used to determine the fair value of options as of the grant date
Risk-free interest rate (as a percent)									1.80%
Risk-free interest rate, minimum (as a percent)										1.02%			0.01%
Risk-free interest rate, maximum (as a percent)										1.13%			2.02%
Expected stock price volatility (as a percent)									37.57%
Expected stock price volatility, minimum (as a percent)										36.35%			36.40%
Expected stock price volatility, maximum (as a percent)										36.76%			36.80%
Expected option life									6 years 3 months	6 years 3 months
Contractual life													14 years
Fair value (in dollars per share)			$ 41.79	$ 25.83					$ 41.79		$ 31.33	$ 35.77		$ 16.12	$ 31.15
Weighted average fair value of stock options granted and total intrinsic value of stock options exercised
Weighted average fair value at grant date per share (in dollars per share)			$ 41.79	$ 25.83					$ 41.79		$ 31.33	$ 35.77		$ 16.12	$ 31.15
Intrinsic value of options exercised (in dollars)			4,124,000	9,625,000
Fair value of options vested (in dollars)			950,000	1,475,000
Estimated forfeiture rate (as a percent)						1.00%	10.00%
Estimated unrecognized compensation costs (in dollars)	$ 1,700,000		$ 1,700,000
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized			2 years 8 months 12 days