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Debt - Debt Acquired in Acquisition (Details) |  | 6 Months Ended |
--- | --- | --- | ---
Sep. 16, 2008 USD ($) subsidiary | Jul. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount |  | $ 300,300,000 | $ 300,800,000
Carrying Amount |  | 294,100,000 | $ 294,300,000
10-year term loan |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 10,000,000.0 |  |
Maturity period | 10 years |  |
Number of subsidiaries acquired | subsidiary | 1 |  |
Carrying Amount |  | 300,000 |
Quarterly installment payment - principal |  | $ 300,000 |
10-year term loan | LIBOR rate |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  | 1.50% |

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