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Accumulated Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Changes in Accumulated Other Comprehensive (Loss) Income | Changes in accumulated other comprehensive (loss) income, which is presented net of tax, consists of the following:
|  | Foreign Currency Translation Adjustment |  |  | Unrealized Gains (Losses) on Marketable Securities |  |  | Retirement Plans Prior Service Credit |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2015, net of tax of $0, (459), $(622) |  | $ | (8,759 | ) |  | $ | (1,414 | ) |  | $ | 2,029 |  |  | $ | (8,144 | )
Other comprehensive (loss) income before reclassifications, net of tax of $0, $923, $34 |  |  | (13,162 | ) |  |  | 2,037 |  |  |  | 59 |  |  |  | (11,066 | )
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(255), $(190) |  |  | — |  |  |  | (683 | ) |  |  | (321 | ) |  |  | (1,004 | )
Net current period other comprehensive (loss) income, net of tax of $0, $668, $(156) |  |  | (13,162 | ) |  |  | 1,354 |  |  |  | (262 | ) |  |  | (12,070 | )
Balance at December 31, 2016, net of tax of $0, $209, $(778) |  |  | (21,921 | ) |  |  | (60 | ) |  |  | 1,767 |  |  |  | (20,214 | )
Other comprehensive income before reclassifications, net of tax of $0, $1,903, $0 |  |  | 37,840 |  |  |  | 1,863 |  |  |  | — |  |  |  | 39,703 |
Amounts reclassified from accumulated other comprehensive income, net of tax of $0, $(297), $(154) |  |  | — |  |  |  | (441 | ) |  |  | (272 | ) |  |  | (713 | )
Net current period other comprehensive income, net of tax of $0, $1,606, $(154) |  |  | 37,840 |  |  |  | 1,422 |  |  |  | (272 | ) |  |  | 38,990 |
Balance at December 31, 2017, net of tax of $0, $1,815, $(932) |  | $ | 15,919 |  |  | $ | 1,362 |  |  | $ | 1,495 |  |  | $ | 18,776 |
Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations | Reclassifications out of accumulated other comprehensive income to the statements of operations for the years ended December 31, 2017, 2016 and 2015, were as follows:
Details about Accumulated Other Comprehensive Income Components |  | For the year ended |  |  | Affected Line Item in the Statements of Operations |
|  | December 31, 2017 |  |  | December 31, 2016 |  |  | December 31, 2015 |  |  |  |
|  | (in thousands) |  |  |  |
Available-for-sale marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains, net of tax of $297, $255, $390 |  | $ | 441 |  |  | $ | 683 |  |  | $ | 704 |  |  |  | Interest income |
Defined benefit pension and postretirement plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service benefit, net of tax of $154, $190, $169 |  |  | 272 |  |  |  | 321 |  |  |  | 295 |  |  |  | (a) |
Total reclassifications, net of tax of $451, $445, $559 |  | $ | 713 |  |  | $ | 1,004 |  |  | $ | 999 |  |  |  | Net income |
(a) | The amortization of prior service credit is included in the computation of net periodic pension cost and postretirement benefit; see Note N: “Retirement Plans.”

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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