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Debt and Credit Facilities - Amended and Restated Senior Secured Credit Facilities (Details) £ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jul. 12, 2018 USD ($) | Jul. 12, 2018 GBP (£) | Jul. 11, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on debt redemption | $ 1,500,000 |  | $ 0 | $ 1,900,000 | $ 0 |  |  |
Interest Expense |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization expense | 500,000 |  |  | 2,700,000 |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facilities |  |  |  |  |  |  |  | $ 700,000,000
Term Loan A due July 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term loans |  |  |  |  |  | $ 186,500,000 | £ 29.4 |
Third Amended And Restated Credit Agreement | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 12500.00% | 12500.00% |
Third Amended And Restated Credit Agreement | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 20000.00% | 20000.00% |
Third Amended And Restated Credit Agreement | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facilities |  |  |  |  |  | $ 1,000,000,000.0 |  |
Loss on debt redemption |  | $ 1,900,000 |  |  |  |  |  |
Accelerated amortization of original issuance discount |  | 1,500,000 |  |  |  |  |  |
Included in debt redemption was non-lender fees incurred |  | 400,000 |  |  |  |  |  |
Debt issuance lender fees |  |  |  |  |  | $ 700,000 |  |
Third Amended And Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Other Assets |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs capitalized | $ 4,900,000 | $ 4,900,000 |  | $ 4,900,000 |  |  |  |

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