Applicable Margin Rate

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- Definition

Current ratio

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- Definition

Debt Disclosure [Line Items]

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- Definition

Debt Instrument, Discounted Percentage

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- Definition

Debt Instrument Interest Additional Interest Above LIBOR Rate

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- Definition

Debt Instrument, Interest Payable Period

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- Definition

Debt To EBITDA Ratio, Maximum

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- Definition

Prepayment Premium

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- Definition

Prepayment Premium, Change in Control

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- Definition

Second Lien Facility

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- Definition

Second Lien Facility, Effective Interest Rate

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- Definition

Second Lien Facility, Initial Interest Rate

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No definition available.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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

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- Definition

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

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No definition available.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The effective interest rate at the end of the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

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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No definition available.

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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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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Long-Term Debt - Additional Information (Details)	1 Months Ended	6 Months Ended
Long-Term Debt - Additional Information (Details)	Apr. 30, 2019	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	May 03, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 29, 2017 USD ($)
Debt Disclosure [Line Items]
Debt Issuance Costs, Line of Credit Arrangements, Gross				$ 2,500,000
Current Ratio				1.00
Second Lien Facility		$ 200,000,000			$ 200,000,000	$ 200,000,000
Proceeds from Debt, Net of Issuance Costs			$ 187,800,000
Debt Instrument, Unamortized Discount		2,795,000			3,159,000	4,000,000.0
Unamortized Debt Issuance Expense		$ 5,729,000			6,466,000	$ 8,200,000
Debt Instrument, Discounted Percentage		98.00%
Year 2 [Member]
Debt Disclosure [Line Items]
Prepayment Premium		102.00%
Prepayment Premium, Change in Control		102.00%
Year 3 [Member]
Debt Disclosure [Line Items]
Prepayment Premium		101.00%
Prepayment Premium, Change in Control		101.00%
Revolving Credit Facility
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 450,000,000		$ 1,000,000,000.0
Line of Credit Facility, Current Borrowing Capacity				$ 500,000,000
Interest Rate at Period End		4.42%
Debt To E B I T D Ratio Maximum				4.00
Line of Credit [Member]
Debt Disclosure [Line Items]
Letters of Credit Outstanding, Amount		$ 400,000			$ 400,000
Line of Credit [Member] \| Letter of Credit
Debt Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 25,000,000
Second Lien Facility [Member]
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR		7.00%
Interest rate option two, applicable margin rate		6.00%
Second Lien Facility, Initial Interest Rate		9.41%	8.34%
Second Lien Facility, Effective Interest Rate		9.89%
Debt Instrument, Term		5 years
Minimum [Member] \| Revolving Credit Facility
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR	0.50%	2.00%
Interest rate option two, applicable margin rate	1.50%	3.00%
Minimum [Member] \| Letter of Credit
Debt Disclosure [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.375%
Maximum [Member] \| Revolving Credit Facility
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR	1.50%	3.00%
Interest rate option two, applicable margin rate	2.50%	4.00%
Maximum [Member] \| Letter of Credit
Debt Disclosure [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Interest Payable One [Member] \| Revolving Credit Facility
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period		1 month
Interest Payable Two [Member] \| Revolving Credit Facility
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period		3 months
Interest Payable Three [Member] \| Revolving Credit Facility
Debt Disclosure [Line Items]
Debt Instrument, Interest Payable Period		6 months