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Derivative Instruments (Details) $ in Thousands |  | 6 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
May 27, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2011 USD ($) instrument | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |
Amortization of interest expense |  | $ 976 | $ 669 |  |
Senior Notes | 4.20% Senior Notes, due December 2021 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate on senior notes |  | 4.20% |  |  | 4.20%
Pre-tax amount included in Accumulated other comprehensive income (loss) |  | $ 3,500 |  |  |
Senior Notes | 4.50% Senior Notes, due December 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate on senior notes |  | 4.50% |  |  | 4.50%
Amount to be recognized from hedged transactions within 12 months, approximate | $ (1,400) |  |  |  |
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 |

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