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Restructuring Charges (Schedule Of Accrued Restructuring Balances) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | $ 1,283 | $ 1,336 |
Restructuring charges | 4,936 | 4,693 |
Cash Payment | (5,891) | (4,728) |
Non-Cash Activity | (42) | (21) |
Foreign Exchange Adjustments | 4 | 3 |
Ending Balance | 290 | 1,283 | $ 1,336
2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 |  |
Restructuring charges | 2,967 |  |
Cash Payment | (2,724) |  |
Non-Cash Activity | 0 |  |
Foreign Exchange Adjustments | 2 |  |
Ending Balance | 245 | 0 |
2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 1,283 | 0 |
Restructuring charges | 1,969 | 4,607 |
Cash Payment | (3,167) | (3,303) |
Non-Cash Activity | (42) | (21) |
Foreign Exchange Adjustments | 2 | 0 |
Ending Balance | 45 | 1,283 | 0
2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 | 1,336 |
Restructuring charges |  | 86 | 8,305
Cash Payment |  | (1,425) |
Non-Cash Activity |  | 0 |
Foreign Exchange Adjustments |  | 3 |
Ending Balance |  | 0 | 1,336
Severance [Member] | 2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 |  |
Restructuring charges | 2,172 |  |
Cash Payment | (2,125) |  |
Non-Cash Activity | 0 |  |
Foreign Exchange Adjustments | 0 |  |
Ending Balance | 47 | 0 |
Severance [Member] | 2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 738 | 0 |
Restructuring charges |  | 3,630 |
Restructuring Reserve Accrual Adjustment | (42) |  |
Cash Payment | (667) | (2,892) |
Non-Cash Activity | 0 | 0 |
Foreign Exchange Adjustments | 0 | 0 |
Ending Balance | 29 | 738 | 0
Severance [Member] | 2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 | 222 |
Restructuring Reserve Accrual Adjustment |  | (1) |
Cash Payment |  | (224) |
Non-Cash Activity |  | 0 |
Foreign Exchange Adjustments |  | 3 |
Ending Balance |  | 0 | 222
Lease Facility Costs [Member] | 2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 |  |
Restructuring charges | 264 |  |
Cash Payment | (264) |  |
Non-Cash Activity | 0 |  |
Foreign Exchange Adjustments | 0 |  |
Ending Balance | 0 | 0 |
Lease Facility Costs [Member] | 2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 | 0 |
Restructuring charges | 58 | 0 |
Cash Payment | (58) | 0 |
Non-Cash Activity | 0 | 0 |
Foreign Exchange Adjustments | 0 | 0 |
Ending Balance | 0 | 0 | 0
Lease Facility Costs [Member] | 2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 | 928 |
Restructuring charges |  | 109 |
Cash Payment |  | (1,037) |
Non-Cash Activity |  | 0 |
Foreign Exchange Adjustments |  | 0 |
Ending Balance |  | 0 | 928
Other Exit Costs [Member] | 2017 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 0 |  |
Restructuring charges | 531 |  |
Cash Payment | (335) |  |
Non-Cash Activity | 0 |  |
Foreign Exchange Adjustments | 2 |  |
Ending Balance | 198 | 0 |
Other Exit Costs [Member] | 2016 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | 545 | 0 |
Restructuring charges | 1,953 | 977 |
Cash Payment | (2,442) | (411) |
Non-Cash Activity | (42) | (21) |
Foreign Exchange Adjustments | 2 | 0 |
Ending Balance | 16 | 545 | 0
Other Exit Costs [Member] | 2015 [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Beginning Balance | $ 0 | 186 |
Restructuring Reserve Accrual Adjustment |  | (22) |
Cash Payment |  | (164) |
Non-Cash Activity |  | 0 |
Foreign Exchange Adjustments |  | 0 |
Ending Balance |  | $ 0 | $ 186

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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