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Allowed Add Back of Pro Forma EBITDA, Second Quarter

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Allowed Add Back of Pro Forma EBITDA, Third Quarter

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Debt Instrument, Commitment Fee Percent, After Closing Date

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Debt Instrument, Covenant, Additional Capital Lease Obligation and Purchase Money Indebtedness Maximum

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Debt Instrument, Covenant, Additional Other Indebtedness, Maximum

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Debt Instrument, Covenant, Equity Contribution

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Debt Instrument, Covenant, Maximum Consolidated Capital Expenditure

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Debt Instrument, Covenant, Maximum First Lien Leverage Ratio

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Debt Instrument, Covenant, Minimum Interest Coverage Ratio

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Debt Instrument, Covenant, Repurchase of Capital Stock, Maximum

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Debt Instrument, Covenant, Tax Sharing Agreement, Distributions Percentage of Net Revenues, Maximum

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Debt Instrument, Periodic Payment, Principal, First Year

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Debt Instrument, Periodic Payment, Principal, Second Year and Thereafter

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Debt Instrument, Repayment Percent of Principal

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Long-Term Debt - Term Loan Facility (Details) - USD ($)			3 Months Ended	9 Months Ended	18 Months Ended
Long-Term Debt - Term Loan Facility (Details) - USD ($)	Jun. 30, 2018	Jan. 24, 2017	Sep. 30, 2019	Sep. 30, 2019	Jul. 24, 2018	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt			$ 527,134,000	$ 527,134,000			$ 543,697,000
Debt Instrument, Covenant, Tax Sharing Agreement, Distributions Percentage of Net Revenues, Maximum		1.00%
Debt Instrument, Covenant, Repurchase of Capital Stock, Maximum		$ 1,000,000
Debt Instrument, Covenant, Additional Capital Lease Obligation and Purchase Money Indebtedness Maximum		40,000,000
Debt Instrument, Covenant, Additional Other Indebtedness, Maximum		$ 10,000,000
Notes Payable to Banks [Member] \| Term Loan Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant, Equity Contribution			20,000,000	20,000,000
Notes Payable to Banks [Member] \| Term Loan Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant, Equity Contribution			24,000,000	24,000,000
Montreign Operating [Member] \| Notes Payable to Banks [Member] \| Term Loan Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant, Maximum First Lien Leverage Ratio		500.00%
Debt Instrument, Covenant, Minimum Interest Coverage Ratio		200.00%
Debt Instrument, Covenant, Maximum Consolidated Capital Expenditure		$ 11,000,000
Allowed Add Back of Pro Forma EBITDA, First Quarter		108,400,000
Allowed Add Back of Pro Forma EBITDA, Second Quarter		77,500,000
Allowed Add Back of Pro Forma EBITDA, Third Quarter		$ 39,400,000
Montreign Operating [Member] \| Notes Payable to Banks [Member] \| Term Loan Facility, Term A Loan [Member]
Debt Instrument [Line Items]
Long-term Debt			$ 57,700,000	$ 57,700,000			$ 64,800,000
Stated percentage			7.12%	7.12%			768.00%
Commitment fee percent, after closing date					5.00%
Debt Instrument, Repayment Percent of Principal						2.50%
Debt Instrument, Periodic Payment, Principal, First Year	$ 1,800,000
Debt Instrument, Periodic Payment, Principal, Second Year and Thereafter				$ 2,600,000
Repayments of Debt			$ 7,000,000
Montreign Operating [Member] \| Notes Payable to Banks [Member] \| Term Loan Facility, Term A Loan [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		5.00%
Montreign Operating [Member] \| Notes Payable to Banks [Member] \| Term Loan Facility, Term A Loan [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		4.00%
Montreign Operating [Member] \| Notes Payable to Banks [Member] \| Term Loan Facility, Term B Loan [Member]
Debt Instrument [Line Items]
Long-term Debt			$ 438,300,000	$ 438,300,000			$ 440,800,000
Stated percentage			10.37%	10.37%			10.96%
Debt Instrument, Repayment Percent of Principal			1.00%	1.00%
Repayments of Debt			$ 3,500,000
Debt Instrument, Periodic Payment, Principal				$ 1,100,000
Montreign Operating [Member] \| Notes Payable to Banks [Member] \| Term Loan Facility, Term B Loan [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		8.25%
Montreign Operating [Member] \| Notes Payable to Banks [Member] \| Term Loan Facility, Term B Loan [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated percentage		1.00%
Montreign Operating [Member] \| Notes Payable to Banks [Member] \| Term Loan Facility, Term B Loan [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		7.25%