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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Properties and equipment |  |
Oil & gas properties under full cost method, accumulated depletion, depreciation and amortization | $ 63,954 | $ 57,077
Shareholders' equity |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares issued (in shares) | 27,896,697 | 27,735,878

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