Consolidated Balance Sheet (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Oil and natural gas properties, amortization excluded	$ 456,692	$ 369,561
Common Stock, Par Value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares, Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	50,807,635	47,106,216
Common Stock, Shares, Outstanding	50,807,635	47,106,216