STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividends [Abstract]
Date Declared	Nov. 20, 2012	Aug. 27, 2012	May 29, 2012	Mar. 12, 2012
Dividend Amount Per Share	$ 0.125	$ 0.125	$ 0.125	$ 0.125			$ 0.5	$ 0	$ 0
Record Date	Dec. 21, 2012	Sep. 21, 2012	Jun. 21, 2012	Mar. 23, 2012
Date Paid	Jan. 07, 2013	Oct. 08, 2012	Jul. 09, 2012	Apr. 09, 2012
Total Dividends	$ 16,800	$ 16,800	$ 17,100	$ 17,700			$ 68,372
Maximum Dividend Amount Per Share							$ 0.125
Share Repurchase [Abstract]
Shares repurchased during the period (in shares)							9.9	10.7
Amount of increase to the share repurchase program (in hundredths)						5.00%	10.00%
Amount of increase to the share repurchase program (in shares)					14.4	7.5
Shares repurchased during the period							$ 328,000	$ 327,723	$ 0
Total remaining common shares authorized to repurchase (in shares)	6.5						6.5