DIVIDENDS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2012
DIVIDENDS PER SHARE [Abstract]
Date declared	2013-07	2013-05	2013-02	2013-05
Cash dividend declared (in dollars per share)	$ 0.30	$ 0.30	$ 0.30
Payment of cash dividends		$ 17,600	$ 17,500	$ 35,140	$ 24,741
Date paid	Sep. 11, 2013	Jun. 12, 2013	Mar. 13, 2013
Date of record	Aug. 23, 2013	May 24, 2013	Feb. 22, 2013