SHAREHOLDERS' EQUITY (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) vote shares	Dec. 31, 2014 shares	Dec. 31, 2013 USD ($) shares	Apr. 30, 2013 shares
Class of Stock
Percentage of the total number of directors the holders of common stock are entitled to elect	25.00%
Common Stock Repurchases
Trade date fair value of shares acquired during period | $	$ 200,000		$ 229,101
Common Stock
Class of Stock
Votes per each share of stock | vote	1
Common stock reserved	19,700,000
Common Stock Repurchases
Treasury stock acquired during period (in shares)	3,000,000	0	4,500,000
Trade date fair value of shares acquired during period | $	$ 200,000		$ 229,100
Number of shares authorized to be repurchased				10,000,000
Remaining number of shares authorized to be repurchased	5,600,000
Class B Convertible Common Stock
Class of Stock
Votes per each share of stock | vote	10