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Accumulated Other Comprehensive Income ("AOCI") (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Summary of Total Changes in AOCI by Component, Net of Tax | The following tables set forth the total changes in AOCI by component, net of tax:
|  | Three Months Ended March 31, 2018 |  |  | Three Months Ended March 31, 2017 |
|  | Defined benefit pension plan activity |  |  | Currency Translation Adjustment |  |  | Total |  |  | Defined benefit pension plan activity |  |  | Currency Translation Adjustment |  |  | Total |
Balance at January 1 |  | $ | (6,014 | ) |  | $ | (41,425 | ) |  | $ | (47,439 | ) |  | $ | (5,874 | ) |  | $ | (51,495 | ) |  | $ | (57,369 | )
Other comprehensive income before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on foreign currency translation adjustment |  |  | 0 |  |  |  | 3,831 |  |  |  | 3,831 |  |  |  | 0 |  |  |  | 5,472 |  |  |  | 5,472 |
Amounts reclassified from AOCI: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of defined benefit pension actuarial gain (a) |  |  | 91 |  |  |  | 0 |  |  |  | 91 |  |  |  | 72 |  |  |  | 0 |  |  |  | 72 |
Net current period other comprehensive income |  |  | 91 |  |  |  | 3,831 |  |  |  | 3,922 |  |  |  | 72 |  |  |  | 5,472 |  |  |  | 5,544 |
Balance at March 31 |  | $ | (5,923 | ) |  | $ | (37,594 | ) |  | $ | (43,517 | ) |  | $ | (5,802 | ) |  | $ | (46,023 | ) |  | $ | (51,825 | )
(a) | This AOCI component is included in the computation of net periodic pension costs.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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