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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated other comprehensive income loss [Line Items] |  |  |  |
Accumulated other comprehensive loss, net of tax, beginning balance |  |  | $ (14,176) |
Other comprehensive gain (loss) before reclassifications |  |  | 4,694 |
Net current period other comprehensive gain (loss) | $ 1,405 | $ 1,064 | 4,694 | $ (1,303)
Accumulated other comprehensive loss, net of tax, ending balance | (9,482) |  | (9,482) |
Foreign currency translaction adjustments [Member] |  |  |  |
Accumulated other comprehensive income loss [Line Items] |  |  |  |
Accumulated other comprehensive loss, net of tax, beginning balance |  |  | (14,544) |
Other comprehensive gain (loss) before reclassifications |  |  | 4,434 |
Net current period other comprehensive gain (loss) |  |  | 4,434 |
Accumulated other comprehensive loss, net of tax, ending balance | (10,110) |  | (10,110) |
Derivative instruments, net of tax [Member] |  |  |  |
Accumulated other comprehensive income loss [Line Items] |  |  |  |
Accumulated other comprehensive loss, net of tax, beginning balance |  |  | 286 |
Other comprehensive gain (loss) before reclassifications |  |  | 254 |
Net current period other comprehensive gain (loss) |  |  | 254 |
Accumulated other comprehensive loss, net of tax, ending balance | 540 |  | 540 |
Unrealized loss on investments, net of tax [Member] |  |  |  |
Accumulated other comprehensive income loss [Line Items] |  |  |  |
Accumulated other comprehensive loss, net of tax, beginning balance |  |  | (74) |
Other comprehensive gain (loss) before reclassifications |  |  | 19 |
Net current period other comprehensive gain (loss) |  |  | 19 |
Accumulated other comprehensive loss, net of tax, ending balance | (55) |  | (55) |
Other [Member] |  |  |  |
Accumulated other comprehensive income loss [Line Items] |  |  |  |
Accumulated other comprehensive loss, net of tax, beginning balance |  |  | 156 |
Other comprehensive gain (loss) before reclassifications |  |  | (13) |
Net current period other comprehensive gain (loss) |  |  | (13) |
Accumulated other comprehensive loss, net of tax, ending balance | $ 143 |  | $ 143 |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: 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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- Definition Amount after tax, before reclassification adjustments of 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 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: 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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