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Accumulated Other Comprehensive Income Details 1 (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Accumulated Other Comprehensive Income [Abstract] |  |  |
Cross Currency Swap interest portion recognized in income | $ 1,043 |  |
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | (62) |  | $ 277
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | (433) |  | (3,710)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (495) |  | (3,433)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | (49) |  | (218)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (446) |  | (3,215)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent | 3,889 |  | 4,811
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent | 875 |  | 1,126
Income Tax Expense (Benefit) | 13,871 | $ 24,135 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2,568 |  | 470
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 3,014 |  | $ 3,685
Cross Currency Swap Revaluation Portion Recognized in Earnings | $ (610) |  |

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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