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Long-Term Debt (Details Textual) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 11, 2018 USD ($) | Sep. 30, 2018 USD ($) Installment | Jun. 10, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Outstanding Amount |  | $ 969,329,000 |  | $ 972,959,000
Revolving Credit Facility [Member] | Incremental Joinder Agreement No. 1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 140,000,000 |  | $ 100,000,000 |
Agreement start date | Jun. 11, 2018 |  |  |
Senior Secured First Lien Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | 940,000,000 |  |
Senior Secured First Lien Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 140,000,000 |  |
Line of Credit Facility, Undrawn |  | $ 140,000,000 |  |
Line of Credit Facility, Expiration Date |  | Oct. 20, 2022 |  |
Senior Secured First Lien Credit Facility [Member] | Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Outstanding Amount |  | $ 0 |  |
Senior Secured First Lien Credit Facility [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | 800,000,000 |  |
Debt Instrument, Outstanding Amount |  | $ 794,000,000 |  |
Debt Instrument, Maturity Date |  | Oct. 20, 2024 |  |
Debt Instrument, Number of Quarterly Payments | Installment |  | 27 |  |
Debt Instrument, Periodic Payment |  | $ 2,000,000 |  |
Debt Instrument, Commencement Date of Quarterly Payments |  | Mar. 31, 2018 |  |
Debt Instrument, Final Installment |  | $ 746,000,000 |  |
Senior Secured Second Lien Credit Facility [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | 200,000,000 |  |
Debt Instrument, Outstanding Amount |  | $ 200,000,000 |  |
Debt Instrument, Maturity Date |  | Oct. 20, 2025 |  |
Credit Facilities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, Weighted Average Interest Rate |  | 5.70% |  |

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