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Restructuring Charges (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2014
USD ($)
position
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Restructuring Charges      
Number of workforce reduced | position 93    
Percentage of reduction in workforce (in hundredths) 11.00%    
Restructuring charge | $ $ 907,000,000 $ 0 $ 907,000