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Accumulated Other Comprehensive Income ("AOCI") (Tables) | 9 Months Ended
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Sep. 30, 2017
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 September 30, 2017 |  |  | Three Months Ended September 30, 2016 |
|  | Defined benefit pension plan activity |  |  | Currency Translation Adjustment |  |  | Total |  |  | Defined benefit pension plan activity |  |  | Currency Translation Adjustment |  |  | Total |
Balance at July 1 |  | $ | (5,719 | ) |  | $ | (43,213 | ) |  | $ | (48,932 | ) |  | $ | (6,082 | ) |  | $ | (45,904 | ) |  | $ | (51,986 | )
Other comprehensive income before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on foreign currency translation adjustment |  |  | 0 |  |  |  | 2,960 |  |  |  | 2,960 |  |  |  | 0 |  |  |  | 1,286 |  |  |  | 1,286 |
Amounts reclassified from AOCI: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of defined benefit pension actuarial gain (a) |  |  | 50 |  |  |  | 0 |  |  |  | 50 |  |  |  | 91 |  |  |  | 0 |  |  |  | 91 |
Net current period other comprehensive income |  |  | 50 |  |  |  | 2,960 |  |  |  | 3,010 |  |  |  | 91 |  |  |  | 1,286 |  |  |  | 1,377 |
Balance at September 30 |  | $ | (5,669 | ) |  | $ | (40,253 | ) |  | $ | (45,922 | ) |  | $ | (5,991 | ) |  | $ | (44,618 | ) |  | $ | (50,609 | )
|  | Nine Months Ended September 30, 2017 |  |  | Nine Months Ended September 30, 2016 |
|  | Defined benefit pension plan activity |  |  | Currency Translation Adjustment |  |  | Total |  |  | Defined benefit pension plan activity |  |  | Currency Translation Adjustment |  |  | Total |
Balance at January 1 |  | $ | (5,874 | ) |  | $ | (51,495 | ) |  | $ | (57,369 | ) |  | $ | (6,235 | ) |  | $ | (47,916 | ) |  | $ | (54,151 | )
Other comprehensive income before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on foreign currency translation adjustment |  |  | 0 |  |  |  | 11,242 |  |  |  | 11,242 |  |  |  | 0 |  |  |  | 3,298 |  |  |  | 3,298 |
Amounts reclassified from AOCI: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of defined benefit pension actuarial loss (a) |  |  | 205 |  |  |  | 0 |  |  |  | 205 |  |  |  | 244 |  |  |  | 0 |  |  |  | 244 |
Net current period other comprehensive income |  |  | 205 |  |  |  | 11,242 |  |  |  | 11,447 |  |  |  | 244 |  |  |  | 3,298 |  |  |  | 3,542 |
Balance at September 30 |  | $ | (5,669 | ) |  | $ | (40,253 | ) |  | $ | (45,922 | ) |  | $ | (5,991 | ) |  | $ | (44,618 | ) |  | $ | (50,609 | )
(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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