DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Millions, unless otherwise specified		1 Months Ended		1 Months Ended		1 Months Ended
	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	Jun. 30, 2011 Foreign currency contracts	Jun. 27, 2011 Foreign currency contracts contract
Derivative financial instruments
Number of interest rate agreements	4		2		2
Notional amount of each agreement	$ 150.0
Fixed rate of derivatives paid (as a percent)			3.51%		4.10%
Variable rate of interest received		three-month LIBOR		three-month LIBOR
Number of foreign currency contract							1
Amount received on net settlement of foreign currency contract						$ 0.5