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Derivative Instruments - Narrative (Details) $ in Thousands, € in Millions | 3 Months Ended | 6 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2011 USD ($) instrument | Jun. 30, 2017 EUR (€) instrument
Derivative [Line Items] |  |  |  |  |
Amortization of interest expense |  | $ 659 | $ 758 |  |
Amount to be recognized from hedged transactions within 12 months, approximate |  | 6,600 |  |  |
Other (Income) Expense Net |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain on derivatives | $ 5,100 | $ 5,500 |  |  |
4.2% Senior Notes, due December 2021 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate on senior notes |  |  |  | 4.20% |
4.5% Senior Notes, due December 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate on senior notes |  |  |  | 4.50% |
Interest Rate Contract |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of instruments held | instrument |  |  |  | 2 |
Interest Rate Exchange Agreement Expiring 2010 and 2011 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amortization of interest expense |  |  |  | $ 68,900 |
Term of amortized interest expense, years |  |  |  | 10 years |
Forward exchange contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of instruments held | instrument |  |  |  |  | 4
Notional amount | € |  |  |  |  | € 180

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