SUBSEQUENT EVENT (Details) (Subsequent event, Unsecured revolving credit facility, USD $) In Millions, unless otherwise specified	0 Months Ended
	Jun. 30, 2014
Subsequent event
Maximum borrowing capacity	$ 2,750
Additional borrowing capacity	750
Maximum borrowing capacity prior to amended and restated credit agreement	$ 2,000
Maximum leverage ratio (as a percent)	3.50
Minimum fixed charge coverage ratio (as a percent)	1.70
LIBOR plus a market rate spread based on the company's leverage ratio
Subsequent event
Debt instrument variable basis rate	LIBOR plus a market rate spread based on the company's leverage ratio
Federal Funds Rate
Subsequent event
Debt instrument variable basis rate	Federal Funds Rate
Interest rate margin (as a percent)	0.50%
Bank of America prime rate
Subsequent event
Debt instrument variable basis rate	Bank of America prime rate
One-month LIBOR plus 1.0 percent plus a market rate spread based on the company's leverage ratio
Subsequent event
Debt instrument variable basis rate	One-month LIBOR plus 1.0 percent plus a market rate spread based on the company's leverage ratio
Interest rate margin (as a percent)	1.00%