SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Common Stock Repurchases and Common Stock Dividend) (Details) (USD $)	1 Months Ended		3 Months Ended							9 Months Ended		1 Months Ended
	Jan. 31, 2013 quarters	Jan. 31, 2012 quarters	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Oct. 31, 2012 Common Stock [Member]	Oct. 31, 2013 Subsequent Event [Member]
Class of Stock [Line Items]
Stock repurchase program authorized amount												$ 50,000,000
Remaining authorized repurchase amount										29,500,000
Dividends declared (per share)	$ 0.08	$ 0.05											$ 0.10
Number of shares repurchased			0
Dividends declared, number of quarters	4	4
Payments of dividends (per share)			$ 0.08	$ 0.08	$ 0.08	$ 0.05	$ 0.05	$ 0.05	$ 0.05
Payments of dividends			$ 2,400,000	$ 2,300,000	$ 2,310,000	$ 1,400,000	$ 1,400,000	$ 1,400,000	$ 1,415,000	$ 7,046,000	$ 4,301,000