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Derivative Instruments and Hedging Activities (Details) $ in Thousands, € in Millions | Mar. 31, 2019 USD ($) | Mar. 31, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€)
--- | --- | --- | --- | --- | ---
Effect of Netting Derivative Instruments | $ (12,000) |  | $ (14,000) |  |
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | 4,000 |  |  |  |
Derivative Asset, Current | 2,242 |  | 211 |  |
Derivative Liability, Current | 144 |  | 127 |  |
Settlement of Notional Amounts | € |  | € (15) |  |  |
Derivative Asset, Noncurrent | 19,019 |  | 22,636 |  |
Derivative Liability, Noncurrent | 29,442 |  | 40,870 |  |
Interest Rate Swap Sold [Member] |  |  |  |  |
Derivative, Notional Amount |  |  | 110,000 |  |
Interest Rate Swap [Member] |  |  |  |  |
Derivative, Notional Amount | 480,000 |  | 480,000 |  |
Derivative Asset, Current | 0 |  | 0 |  |
Derivative Liability, Current | 0 |  | 0 |  |
Derivative Liability, Noncurrent | 0 |  | 0 |  |
Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Derivative, Notional Amount | 570,349 |  | 574,315 | $ 422,000 | € 400
Derivative Asset, Current | 2,242 |  | 211 |  |
Derivative Liability, Current | 144 |  | 127 |  |
Derivative Asset, Noncurrent | 7,669 |  | 7,669 |  |
Derivative Liability, Noncurrent | 29,442 |  | 40,870 |  |
Interest Rate Swap [Member] |  |  |  |  |
Derivative Asset, Noncurrent | 11,350 |  | $ 14,967 |  |
2018 Cross Currency Swaps [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Derivative, Notional Amount | $ 184,000 | € 160 |  |  |

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