SUBSEQUENT EVENTS (Detail Textuals) - $ / shares		3 Months Ended												12 Months Ended
	Mar. 07, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
Cash dividend declared per share		$ 0.16	$ 0.16	$ 0.16	$ 0.16	$ 0.15	$ 0.15	$ 0.15	$ 0.15					$ 0.64	$ 0.60	$ 0.56
Dividends payable, payment date		Dec. 11, 2015	Sep. 21, 2015	Jun. 19, 2015	Mar. 23, 2015	Dec. 15, 2014	Sep. 22, 2014	Jun. 23, 2014	Mar. 24, 2014	Dec. 16, 2013	Sep. 23, 2013	Jun. 24, 2013	Mar. 25, 2013
Dividends payable record date		Dec. 07, 2015	Sep. 14, 2015	Jun. 15, 2015	Mar. 20, 2015	Dec. 08, 2014	Sep. 15, 2014	Jun. 16, 2014	Mar. 17, 2014	Dec. 09, 2013	Sep. 16, 2013	Jun. 17, 2013	Mar. 18, 2013
Subsequent Event
Subsequent Event [Line Items]
Cash dividend declared per share	$ 0.17
Dividends payable, declared date	Mar. 07, 2016
Dividends payable, payment date	Mar. 28, 2016
Dividends payable record date	Mar. 21, 2016