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Shareholders' Equity Details 2 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Note [Abstract] |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | $ (1,679) | $ 1,034 |
Cross Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 1,416 | 0 |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 0 | 6,756 |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 263 | 5,722 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 536 | (987) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (273) | (4,735) | $ (8,261)
Amortization of actuarial (gains) losses and plan amendments and prior service cost | 20,137 | 23,925 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent | 5,264 | 7,195 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | $ 14,873 | $ 16,730 |

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