SHAREHOLDERS' EQUITY (Common Stock and Preferred Stock) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 29, 2012	Dec. 31, 2013 class series	Dec. 31, 2012	Dec. 31, 2011
Class of Stock
Common stock, authorized (in shares)		200,000,000
Common stock, par value per share (in dollars per share)		$ 0.1
Common stock, issued (in shares)		119,399,983	118,245,320
Common stock, outstanding (in shares)		119,399,983	118,245,320
Stock issued as partial consideration of acquisition of unproved oil and natural gas properties (in shares)	2,657,000
Value of stock issued as partial consideration of acquisition of unproved oil and natural gas properties	$ 36,431	$ 0	$ 36,431	$ 0
Preferred stock, authorized (in shares)		10,000,000
Preferred stock, par value per share (in dollars per share)		$ 0.01
Preferred stock, number of classes of preferred stock		2
Preferred stock, minimum number of series that preferred stock is issuable		1
Preferred stock, issued (in shares)		0	0
Preferred stock, outstanding (in shares)		0	0
Senior Preferred Stock
Class of Stock
Preferred stock, authorized (in shares)		7,400,000
Junior Preferred Stock
Class of Stock
Preferred stock, authorized (in shares)		2,700,000