EARNINGS PER SHARE (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic and diluted earnings per share attributable to common and restricted shares of common stock
Total shares of common stock, basic (in dollars per share)	$ 0.23	$ 0.21	$ 0.38	$ 0.34
Total shares of common stock, diluted (in dollars per share)	$ 0.23	$ 0.21	$ 0.38	$ 0.34
Common Stock
Basic and diluted earnings per share attributable to common and restricted shares of common stock
Total shares of common stock, basic (in dollars per share)	$ 0.23	$ 0.21	$ 0.38	$ 0.34
Total shares of common stock, diluted (in dollars per share)	$ 0.23	$ 0.21	$ 0.38	$ 0.34
Restricted shares of common stock
Basic and diluted earnings per share attributable to common and restricted shares of common stock
Total shares of common stock, basic (in dollars per share)	$ 0.22	$ 0.21	$ 0.38	$ 0.33
Total shares of common stock, diluted (in dollars per share)	$ 0.22	$ 0.21	$ 0.38	$ 0.33