EQUITY (Details) (USD $)	0 Months Ended								12 Months Ended						0 Months Ended	12 Months Ended
	Oct. 29, 2012	Aug. 01, 2012	Apr. 24, 2012	Feb. 29, 2012	Nov. 02, 2011	Aug. 01, 2011	Aug. 02, 2011	May 03, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Ordinary Dividends	Dec. 31, 2011 Ordinary Dividends	Dec. 31, 2012 Return of Capital	Dec. 31, 2011 Return of Capital	Jan. 07, 2013 Subsequent Event	Dec. 31, 2012 Restricted Stock Units (RSUs)	Dec. 31, 2011 Restricted Stock Units (RSUs)	Dec. 31, 2012 Stock Options	Dec. 31, 2011 Stock Options
Equity
Stock issuance, shares						11,700,000	11,700,000
Stock issuance						$ 163,900,000			$ 51,000	$ 163,238,000
Shares sold to underwriters (in shares)						1,500,000
Purchase price per share sold to underwriters (USD per share)						$ 14.75
Stock-based compensation, issued during period (in shares)																165,857	54,983	41,640	45,657
Common dividends, declared	$ 0.33	$ 0.33	$ 0.33	$ 0.33	$ 0.32		$ 0.32	$ 0.32	$ 1.32	$ 0.96					$ 0.34
Common dividends, paid									$ 1.32	$ 0.96	$ 0.7992	$ 0.7833	$ 0.5208	$ 0.1767