INVIGORATE PROGRAM (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Total restructuring and integration charges	$ 39,729,000
Adiditional costs	4,700,000
Cost of Services [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and integration charges	16,600,000
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and integration charges	23,100,000
Professional Fees [Member]
Restructuring Cost and Reserve [Line Items]
Adiditional costs	3,900,000
Invigorate Program [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring and integration charges	39,729,000
Management Layer Reduction Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Incurred cost	18,100,000
Voluntary Retirement Program (Invigorate Program) [Member]
Restructuring Cost and Reserve [Line Items]
Incurred cost	$ 3,000,000
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated	400
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated	600