DEBT (Details) (USD $)	3 Months Ended
	Mar. 31, 2014 Credit Facility	Oct. 31, 2013 Senior Notes due 2018	Mar. 31, 2014 Senior Notes due 2018 Carrying value
Debt and credit facility
Term	4 years
Principal amount		$ 600,000,000
Interest rate (as a percent)		2.875%
Effective interest rate (as a percent)		2.983%
Issuance costs		5,400,000
Issuance discount		3,000,000
Value of the Notes			595,400,000
Maximum aggregate borrowings under the facility	750,000,000
Borrowings outstanding under the facility	$ 130,000,000