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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract] |
Summary Of Accumulated Other Comprehensive Income |
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﻿(Dollars in thousands) | Foreign Currency Items |  | Unrealized Gain (Losses) on Available-for-Sale Investments |  | Accrued Pension Service Costs |  | Total
﻿Balance at January 1, 2018 | $ | 23,575 |  | $ | 8 |  | $ | (2,592) |  | $ | 20,991
﻿Net current-period other comprehensive (loss) income |  | (800) |  |  | (2) |  |  | 52 |  |  | (750)
﻿Balance at March 31, 2018 | $ | 22,775 |  | $ | 6 |  | $ | (2,540) |  | $ | 20,241
﻿

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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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