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Earnings per Share Basis and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator        
Net income $ (15,668) $ (6,996) $ (29,898) $ (15,451)
Denominator        
Weighted average shares (basic) 29,565,000 28,958,000 29,470,000 28,813,000
Dilutive effect of potential common shares 0 0 0 0
Weighted average shares (diluted) 29,565,000 28,958,000 29,470,000 28,813,000
Basic earnings per share $ (0.53) $ (0.24) $ (1.01) $ (0.54)
Diluted earnings per share $ (0.53) $ (0.24) $ (1.01) $ (0.54)