DIVIDENDS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Dividends Payable [Line Items]
Date declared			2015-01		2015-01
Cash dividend declared (in dollars per share)			$ 0.350
Payment of cash dividends			$ 20,694	$ 41,179	$ 40,511
Date paid				Mar. 18, 2015
Date of record				Feb. 27, 2015
Dividend Declared 2015 Q1 [Member]
Dividends Payable [Line Items]
Date declared	2015-04			2015-04
Cash dividend declared (in dollars per share)	$ 0.350
Payment of cash dividends		$ 20,485
Date paid				Jun. 10, 2015
Date of record				May 22, 2015
Dividend Declared 2015 Q2 [Member] | Subsequent Event [Member]
Dividends Payable [Line Items]
Date declared	2015-08			2015-08
Cash dividend declared (in dollars per share)	$ 0.350
Date paid				Sep. 16, 2015
Date of record				Aug. 28, 2015