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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net income | $ (16,543) | [1],[2],[3] | $ 88,641 | [4] | $ 111,387 | [5] | $ 33,564 | [6] | $ 129,071 | [7],[8] | $ 56,706 | [9] | $ 87,252 | [10] | $ 96,844 | [11] | $ 217,049 | $ 369,873 | $ 384,820
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation reclassification adjustment included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,266 | (349)
Unrealized gains on marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains on marketable securities arising during period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,106 | 1,293 | 1,466
Less: Reclassification adjustment for gains included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (799) | (1,296) | 93
Total unrealized gain (loss) on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,307 | (3) | 1,559
Defined benefit pension and post-retirement plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost arising during period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,279
Less: Amortization of prior service (benefit) cost included in net periodic pension and post-retirement costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (233) | 14 | 310
Total defined benefit plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (233) | 14 | 3,589
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,074 | 2,277 | 4,799
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 218,123 | $ 372,150 | $ 389,619
[1] | Restructuring and other, net includes a ($0.4) million fair value adjustment to decrease LitePoint acquisition contingent consideration.
[2] | In the fourth quarter ended December 31, 2012, we corrected prior period income tax provision (benefit) errors that resulted in a $0.2 million income tax provision. These errors were not individually or in aggregate material to the fourth quarter of 2012 or any prior period.
[3] | In the fourth quarter ended December 31, 2012, the change in recognizing pension and postretirement benefit plans expense, as a result of the mark-to-market adjustments, decreased gross profit and net income by $8.1 million and $18.3 million, respectively. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[4] | Restructuring and other, net includes $0.7 million of severance charges related to the headcount reductions of 9 people, of which $0.5 million and 7 people were in Systems Test Group, $0.2 million and 2 people were in Wireless Test.
[5] | Restructuring and other, net includes $0.3 million of severance charges related to headcount reductions of 10 people in Semiconductor Test and ($6.5) million fair value adjustment to decrease the LitePoint acquisition contingent consideration.
[6] | Restructuring and other, net includes a ($1.8) million fair value adjustment to decrease the LitePoint acquisition contingent consideration.
[7] | Restructuring and other, net includes $0.5 million of charges related to pension settlement and $3.3 million to the acquisition of LitePoint.
[8] | In the fourth quarter ended December 31, 2011, the change in recognizing pension and postretirement benefit plans expense, as a result of the mark-to-market adjustments, decreased gross profit and net income by $2.4 million and $6.1 million, respectively. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[9] | Restructuring and other, net includes $1.4 million of charges related to the acquisition of LitePoint.
[10] | Restructuring and other, net includes $0.3 million of severance charges related to headcount reductions of approximately 2 people in Semiconductor Test and $0.7 million related to pension settlement charges.
[11] | Restructuring and other, net includes $0.8 million of severance charges related to headcount reductions of approximately 5 people in Semiconductor Test and $(0.4) million credit related to early exit of previously impaired leased facilities in Westford and North Reading, Massachusetts.

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