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Operations and Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | $ (59,277) |  |
Other Comprehensive Income (Loss), Net of Income Tax | (4,404) | $ (3,540) | $ (710)
Accumulated other comprehensive income (loss), end of the period | (63,681) | (59,277) |
Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | (59,277) | (55,737) | (49,078)
Other comprehensive income (loss) before reclassifications, net of tax | (5,498) | 803 | (3,441)
Amounts reclassified from accumulated other comprehensive income (loss) before tax | 1,443 | (5,726) | 3,602
Reclassification from AOCI, Current Period, Tax | (349) | 1,383 | (871)
Other Comprehensive Income (Loss), Net of Income Tax | (4,404) | (3,540) | (710)
Accumulated other comprehensive income (loss), end of the period | (63,681) | (59,277) | (55,737)
Cash Flow Hedging Gain (Loss) [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | 493 | 4,085 | (3,530)
Other comprehensive income (loss) before reclassifications, net of tax | (5,393) | 2,936 | 7,639
Amounts reclassified from accumulated other comprehensive income (loss) before tax | (1,378) | (8,607) | 913
Reclassification from AOCI, Current Period, Tax | 333 | 2,079 | (221)
Other Comprehensive Income (Loss), Net of Income Tax | (6,438) | (3,592) | 8,331
Accumulated other comprehensive income (loss), end of the period | (5,945) | 493 | 4,085
Pension Liability [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | (31,691) | (31,718) | (25,813)
Other comprehensive income (loss) before reclassifications, net of tax | (7,068) | (2,158) | (2,711)
Amounts reclassified from accumulated other comprehensive income (loss) before tax | 2,821 | 2,881 | 2,689
Reclassification from AOCI, Current Period, Tax | (682) | (696) | (650)
Other Comprehensive Income (Loss), Net of Income Tax | (4,929) | 27 | (672)
Accumulated other comprehensive income (loss), end of the period | (36,620) | (31,691) | (31,718)
Cumulative Translation Adjustment [Member] |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Accumulated other comprehensive income (loss), beginning of the period | (28,079) | (28,104) | (19,735)
Other comprehensive income (loss) before reclassifications, net of tax | 6,963 | 25 | (8,369)
Amounts reclassified from accumulated other comprehensive income (loss) before tax | 0 | 0 | 0
Reclassification from AOCI, Current Period, Tax | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Income Tax | 6,963 | 25 | (8,369)
Accumulated other comprehensive income (loss), end of the period | $ (21,116) | $ (28,079) | (28,104)
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Loss [Member] | Cumulative effect of change in accounting principle(b) |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Cumulative effect of change in accounting principle(b) |  |  | (5,949)
Accounting Standards Update 2018-02 [Member] | Pension Liability [Member] | Cumulative effect of change in accounting principle(b) |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Cumulative effect of change in accounting principle(b) |  |  | (5,233)
Accounting Standards Update 2018-02 [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Cumulative effect of change in accounting principle(b) |  |  |
Accumulated other comprehensive income (loss) [Roll Forward] |  |  |
Cumulative effect of change in accounting principle(b) |  |  | $ (716)

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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