INTEREST RATE SWAP AGREEMENTS (Details) (USD $) In Millions, unless otherwise specified		1 Months Ended	12 Months Ended		0 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Oct. 31, 2007 Interest rate swap agreement effective October 31, 2007	Dec. 31, 2012 Interest rate swap agreement effective October 31, 2007	Oct. 15, 2007 Interest rate swap agreement effective October 31, 2007	Jun. 11, 2009 Interest rate swap agreement effective April 30, 2008	Mar. 31, 2008 Interest rate swap agreement effective April 30, 2008	Dec. 31, 2012 Interest rate swap agreement effective April 30, 2008	Mar. 19, 2008 Interest rate swap agreement effective April 30, 2008
Interest rate swap agreement
Term of interest rate swap agreement		5 years				4 years 6 months
Notional amount				$ 100.0	$ 20.0			$ 35.0
Variable rate basis			3 month LIBOR				3 month LIBOR
Fixed interest rate (as a percent)				5.135%				3.43%
Term loans and the revolving credit facility	135.0
Partial termination fee expensed					$ 0.6