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Financial Instruments and Fair Value Measurements - Derivatives Narrative (Details) $ in Thousands, £ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 GBP (£) derivative | May 31, 2019 USD ($) derivative
Interest rate swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rate swap unrealized loss expected to be reclassified within next twelve months | $ 5,500 | $ 5,500 |  |
Interest rate swaps | Interest expense |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gains (losses) reclassified to income statement | (454) | (1,100) |  |
Cross-currency swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Cross-currency swap unrealized gains expected to be reclassified within next twelve months | 1,600 | 1,600 |  |
Cross-currency swaps | Cash flow hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Number of derivative instruments | derivative |  |  | 4 | 4
Swap exchange notional amount |  |  | £ 130 | $ 166,000
Cross-currency swaps | Foreign exchange gains |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gains (losses) reclassified to income statement | $ 1,400 | $ 1,400 |  |

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