SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended		1 Months Ended
	Dec. 31, 2009 Y	May 21, 2008 Interest rate swap contracts agreement	May 31, 2008 Agreements which were effective on June 9, 2009 and expired on June 9, 2010	May 21, 2008 Agreements which were effective on June 9, 2009 and expired on June 9, 2010 agreement	May 31, 2008 Agreements which were effective on June 9, 2010 and expired on June 9, 2011	May 21, 2008 Agreements which were effective on June 9, 2010 and expired on June 9, 2011 agreement
Derivative financial instruments
Number of interest rate agreements		4		2		2
Notional amount		$ 150.0
Fixed rate of derivatives paid (as a percent)				3.51%		4.10%
Variable rate of interest received (in months)			three-month LIBOR		three-month LIBOR
Weighted-average assumptions used in the lattice option-pricing model
Expected volatility (as a percent)	44.00%
Expected dividend yield (as a percent)	0.78%
Expected term (in years)	6
Risk-free rate (as a percent)	3.34%
Forfeiture rate (as a percent)	5.00%