Senior Debt (Details) - USD ($)	6 Months Ended
Jun. 30, 2020	Aug. 05, 2019
Debt Instrument [Line Items]
Senior debt, net	$ 198,500,000
Original issue discount		$ 2,000,000.0
Debt issuance costs		$ 6,300,000
Letters of credit, amount outstanding	$ 88,800,000
Actual fixed charge coverage ratio	1.52
2020	$ 1,000,000
2021	2,000,000
2022	2,000,000
2023	2,000,000
2024	2,000,000
Thereafter	189,500,000
Original Issue Discount [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	1,700,000
Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	6,100,000
Term loan credit [Member]
Debt Instrument [Line Items]
Senior debt, net	$ 198,500,000
Maturity date	Aug. 05, 2026
Debt Instrument, Frequency of Periodic Payment	quarterly
Debt Instrument, Periodic Payment, Percent	1.00%
Incremental term loans available	$ 150,000,000
Required consolidated senior secured leverage ratio, minimum	2.00
2020	$ 1,000,000
2021	2,000,000
2022	2,000,000
2023	2,000,000
2024	2,000,000
Thereafter	189,500,000
Term loan credit [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Senior debt, net	$ 200,000,000
Term loan credit [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Basis margin on variable rate	4.50%
Actual margin on variable rate	4.69%
ABL credit facility [Member]
Debt Instrument [Line Items]
Senior debt, net	$ 0
Line of Credit Facility, Remaining Borrowing Capacity	$ 211,200,000
Maturity date	Aug. 05, 2024
Line of credit commitment fee percentage	0.25%
Line of credit commitment fee	$ 400,000
Line of credit additional borrowing capacity	$ 100,000,000
Required proforma fixed charge coverage ratio, minimum	1.10
Required consolidated fixed charge coverage ratio, minimum	1.10
2020	$ 0
2021	0
2022	0
2023	0
2024	0
Thereafter	$ 0
ABL credit facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of credit commitment fee percentage	0.25%
ABL credit facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Senior debt, net	$ 300,000,000
Letters of credit, amount outstanding	$ 150,000,000
Line of credit commitment fee percentage	0.375%
ABL credit facility [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Actual margin on variable rate	1.69%
ABL credit facility [Member] \| Eurodollar [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Basis margin on variable rate	1.50%
ABL credit facility [Member] \| Eurodollar [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Basis margin on variable rate	2.00%

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Debt Instrument, Periodic Payment, Percent

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Line of Credit Facility, Additional Borrowing Capacity

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Original issue discount

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Required consolidated senior secured leverage ratio, minimum

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Required minimum consolidated fixed charge coverage ratio

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Required minimum proforma fixed charge coverage ratio

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Amount of short-term and long-term debt and lease obligation.

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

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No definition available.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of the fee for available but unused credit capacity under the credit facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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