(Loss) / Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Numerator:      
Net (loss) / income $ (3,920) $ 37,523 $ (105,204)
Denominator (number of shares):      
Basic and diluted weighted average ordinary shares outstanding 109,676,056 109,654,199 109,612,737