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Condensed Consolidated Statement of Operations (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]        
General and administrative expenses, equity based compensation $ 428 $ 886 $ 1,311 $ 1,969
Unrealized gains on derivative instruments $ 57 $ 192 $ 130 $ 188