ALEXION PHARMACEUTICALS INC | 2013 | FY | 3

Other Comprehensive Income and Accumulated Other Comprehensive Income
The following table summarizes the changes in AOCI, by component, for the years ended December 31, 2013, 2012 and 2011:

Defined Benefit Pension Plans
 
Unrealized Gains (Losses) from Marketable Securities
 
Unrealized Gains (Losses) from Hedging Activities
 
Foreign Currency Translation Adjustment
 
Total Accumulated Other Comprehensive Income (Loss)
Balances, December 31, 2010
$
(3,018
)
 
$
10

 
$
(2,501
)
 
$
(1,631
)
 
$
(7,140
)
Other comprehensive income before reclassifications
(1,386
)
 
(10
)
 
7,121

 
(1,328
)
 
4,397

Amounts reclassified from other comprehensive income
221

 
—

 
6,701

 
—

 
6,922

Net other comprehensive income (loss)
(1,165
)
 
(10
)
 
13,822

 
(1,328
)
 
11,319

Balances, December 31, 2011
$
(4,183
)
 
$
—

 
$
11,321

 
$
(2,959
)
 
$
4,179

Other comprehensive income before reclassifications
(1,807
)
 
—

 
14,856

 
150

 
13,199

Amounts reclassified from other comprehensive income
278

 
—

 
(11,021
)
 
—

 
(10,743
)
Net other comprehensive income (loss)
(1,529
)
 
—

 
3,835

 
150

 
2,456

Balances, December 31, 2012
$
(5,712
)
 
$
—

 
$
15,156

 
$
(2,809
)
 
$
6,635

Other comprehensive income before reclassifications
(6,175
)
 
(197
)
 
(1,000
)
 
(4,573
)
 
(11,945
)
Amounts reclassified from other comprehensive income
385

 
51

 
(17,983
)
 
—

 
(17,547
)
Net other comprehensive income (loss)
(5,790
)
 
(146
)
 
(18,983
)
 
(4,573
)
 
(29,492
)
Balances, December 31, 2013
$
(11,502
)
 
$
(146
)
 
$
(3,827
)
 
$
(7,382
)
 
$
(22,857
)


The table below provides details regarding significant reclassifications from AOCI during the years ended December 31, 2013, 2012 and 2011:
Details about Accumulated Other Comprehensive Income Components
 
Amount Reclassified From Accumulated Other Comprehensive Income during the year ended December 31,
 
Affected Line Item in the Consolidated Statements of Operations
 
2013
2012
2011
 
Unrealized Gains (Losses) on Hedging Activity
 
 
 
 
 
 
Effective portion of foreign exchange contracts
 
$
20,569

$
12,869

$
(6,558
)
 
Net product sales
Ineffective portion of foreign exchange contracts
 
(915
)
(824
)
(766
)
 
Foreign currency loss
 
 
19,654

12,045

(7,324
)
 
 
 
 
(1,671
)
(1,024
)
623

 
Income tax provision
 
 
$
17,983

$
11,021

$
(6,701
)
 
 
Unrealized Gains (Losses) from Marketable Securities
 
 
 
 
 
 
Realized gains (losses) on sale of securities
 
$
(81
)
$
—

$
—

 
Investment income
 
 
(81
)
—

—

 
 
 
 
30

—

—

 
Income tax provision
 
 
$
(51
)
$
—

$
—

 
 
Defined Benefit Pension Items
 
 
 
 
 
 
Amortization of prior service costs and actuarial losses
 
$
(421
)
$
(304
)
$
(242
)
 
(a)
 
 
(421
)
(304
)
(242
)
 
 
 
 
36

26

21

 
Income tax provision
 
 
$
(385
)
$
(278
)
$
(221
)
 
 
(a) This AOCI component is included in the computation of net periodic pension benefit cost (see Note 16 for additional details).

us-gaap:ComprehensiveIncomeNoteTextBlock