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Subsequent Events (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2016
USD ($)
AOA / $
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Subsequent Event [Line Items]        
Equity in net earnings (losses) of unconsolidated companies   $ (1,710) $ (7,070) $ 9,104
Subsequent Event        
Subsequent Event [Line Items]        
Percentage Loss on devaluation of exchange rates 17.00%      
Percentage of Foreign Currency Income Loss 49.00%      
Equity in net earnings (losses) of unconsolidated companies $ 8,000      
Subsequent Event | Sonatide joint venture        
Subsequent Event [Line Items]        
Foreign currency transaction exchange loss $ 17,000      
Subsequent Event | Minimum        
Subsequent Event [Line Items]        
Devaluation of exchange rate | AOA / $ 135      
Subsequent Event | Maximum        
Subsequent Event [Line Items]        
Devaluation of exchange rate | AOA / $ 158