EMPLOYEE COMPENSATION PLANS (NARRATIVE) (DETAILS) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
EMPLOYEE COMPENSATION PLANS [Abstract]
Company Match on US Defined Contribution Plans	$ 3,000,000	$ 1,900,000	$ 2,200,000
Shares Authorized under Current Equity Compensation Plan	4,000,000
Shares Available for Issuance under Current Equity Compensation Plan	2,300,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	13,376,000	15,856,000	13,372,000
Total Tax Benefit Recognized for Equity-Based Compensation Expense	5,700,000	11,600,000	5,200,000
Intrinsic Value of RSUs Vested	15,500,000	13,900,000	10,600,000
Intrinsic Value of Non-Vested RSUs	37,100,000
Options Granted in 2011 to Key Employee		150,000
Weighted Average Grant Date Fair Value of Options Granted		$ 8.68
Intrinsic Value of Options Exercised	600,000	12,600,000	2,300,000
Fair Value of Shares Vested		100,000	700,000
Proceeds from exercise of stock options	1,374,000	14,762,000	2,792,000
Recognized Tax Benefit from Exercise of Stock Options	200,000	5,000,000	1,000,000
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Expense	600,000
Requisite Service Period	1 year 6 months 0 days
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Expense	26,500,000
Requisite Service Period	1 year 7 months 6 days
Cost of Services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	1,900,000
Selling General And Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 11,500,000