SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Common Stock Repurchases and Common Stock Dividend) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	1 Months Ended			3 Months Ended								12 Months Ended			1 Months Ended		12 Months Ended
	Jan. 31, 2012 quarters	Oct. 31, 2010 quarters	Jan. 31, 2010 quarters	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013 quarters	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 31, 2012 Common Stock [Member]	Feb. 28, 2011 Common Stock [Member]	Dec. 31, 2013 Common Stock [Member]	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]
Class of Stock [Line Items]
Stock repurchase program authorized amount															$ 50,000,000	$ 50,000,000
Number of shares repurchased																		700	1,500
Cost of shares repurchased													20,467,000	50,000,000				20,500,000	50,000,000
Remaining authorized repurchase amount																	29,500,000
Dividends declared, number Of quarters	4	4	4				4
Common stock dividends declared				$ 0.08	$ 0.08	$ 0.08	$ 0.08	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.08
Common stock dividends declared, payable 1st quarter 2014												$ 0.1
Common stock dividends declared, payable 2nd quarter 2014												$ 0.1
Common stock dividends declared, payable 3rd quarter 2014												$ 0.1
Common stock dividends declared, payable 4th quarter 2014												$ 0.1
Payments of dividends				$ 2,400,000	$ 2,400,000	$ 2,300,000	$ 2,300,000	$ 1,400,000	$ 1,400,000	$ 1,400,000	$ 1,400,000	$ 9,446,000	$ 5,755,000	$ 5,722,000