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Accumulated Other Comprehensive Loss
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss

The following tables provide a reconciliation of the components of accumulated other comprehensive loss, net of tax, attributable to The Medicines Company for the three months ended March 31, 2018 and 2017:
 
 
Three Months Ended March 31,
 
 
2018
 
2017
 
 
Foreign currency translation adjustment
 
Foreign currency translation adjustment
 
 
(in thousands)
Balance at beginning of period
 
$
(5,183
)
 
$
(5,479
)
Other comprehensive loss before reclassifications
 
(471
)
 
(328
)
Amounts reclassified from accumulated other comprehensive income(1)
 
1,183

 
—

Total other comprehensive loss
 
712

 
(328
)
Balance at end of period
 
$
(4,471
)
 
$
(5,807
)


(1) See Note 15, “Discontinued Operations,” for a discussion of this reclassification of foreign currency translation adjustment.