DIVIDENDS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
DIVIDENDS PER SHARE [Abstract]
Date declared	2012-05	2012-01	2012-05
Cash dividend declared (in dollars per share)			$ 0.2
Payment of cash dividends	$ 12,300	$ 12,500	$ 24,741	$ 16,714
Date paid	Jun. 13, 2012	Mar. 14, 2012
Date of record	May 25, 2012	Feb. 24, 2012