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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Accounting Policies [Abstract] |
Schedule of Accumulated Other Comprehensive Income | The components of accumulated other comprehensive income as of December 31 are as follows:
|  | 2012 |  | 2011
|  | (dollars in thousands)
Foreign currency translation adjustments |  | $ | 53,380 |  |  | $ | 49,450 |
Unrecognized prior service cost and unrecognized loss in actuarial assumptions |  | (12,440 | ) |  | (9,870 | )
Unrealized loss on derivatives |  | (1,680 | ) |  | — |
Accumulated other comprehensive income |  | $ | 39,260 |  |  | $ | 39,580 |
|  | Pension Benefit |  | Postretirement Benefit
|  | 2012 |  | 2011 |  | 2012 |  | 2011
|  | (dollars in thousands)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Unrecognized prior-service cost |  | $ | 130 |  |  | $ | 130 |  |  | $ | — |  |  | $ | (1,530 | )
Unrecognized net loss/(gain) |  | 19,430 |  |  | 17,280 |  |  | (570 | ) |  | (680 | )
Total accumulated other comprehensive income (loss) recognized at December 31 |  | $ | 19,560 |  |  | $ | 17,410 |  |  | $ | (570 | ) |  | $ | (2,210 | )

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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=20435746&loc=SL7669686-108580 + Details
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