INTEREST RATE SWAP AGREEMENTS (Details) (USD $)		1 Months Ended	3 Months Ended		0 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2013	Oct. 31, 2007 Interest rate swap agreement effective October 31, 2007	Mar. 31, 2013 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	Mar. 31, 2013 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				$ 100,000,000	$ 20,000,000			$ 35,000,000
Variable rate basis			3 month LIBOR				3 month LIBOR
Fixed interest rate (as a percent)				5.135%				3.43%
Fair value								0
Term loans and the revolving credit facility	135,000,000
Partial termination fee expensed					$ 600,000