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Other operational loss (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 29, 2010
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Operational Loss [Abstract]        
Percentage of future proceeds sold 45.00%      
Sale of future claims proceeds $ 5,000      
Loss Contingencies [Line Items]        
Other operational loss   $ 0 $ 94 $ 1,125
Commercial claim        
Loss Contingencies [Line Items]        
Other operational loss       $ 1,125