Represents the floor rate of the variable rate basis used to arrive at interest rate payable on debt.

No definition available.

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- Definition

Percentage of the aggregate principal amount of the notes originally issued under the indenture which must remain outstanding at redemption under terms of the notes.

+ References

No definition available.

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- Definition

Represents the period from completion of equity offering, during which notes can be redeemed by the entity.

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No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer from net proceeds raised in connection with an equity offering.

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No definition available.

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- Definition

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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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

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

+ References

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- Definition

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.

+ References

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.

+ References

No definition available.

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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Balance Type:	debit
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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

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

+ References

No definition available.

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Fair value of the amount outstanding under the credit facility.

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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.

+ References

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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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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Long-term Debt - Senior Secured Credit Facility and Senior Notes (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 19, 2017	Jun. 30, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Long-term Debt
Loss on early extinguishment of debt		$ 2,579,000		$ 3,461,000	$ 23,390,000
Senior Secured Credit Facility
Long-term Debt
Refinancing costs					1,700,000
Loss on early extinguishment of debt					2,300,000
Term loan amount outstanding		590,000,000		590,000,000
Revolving credit facility
Long-term Debt
Term of debt	5 years
Maximum borrowing capacity	$ 700,000,000
Available borrowing capacity		678,000,000		678,000,000
Revolver amount outstanding		0		0
Letters of credit outstanding		22,000,000		22,000,000
Term Loan A Facility
Long-term Debt
Term of debt	5 years
Maximum borrowing capacity	$ 300,000,000
Variable interest rate	LIBOR
Term loan amount outstanding		281,300,000		281,300,000
Term Loan B Facility
Long-term Debt
Term of debt	7 years
Maximum borrowing capacity	$ 500,000,000
Variable interest rate	LIBOR
Variable interest rate spread (as a percent)	2.50%
Variable interest base rate floor rate (as a percent)	0.75%
Loss on early extinguishment of debt		2,600,000		3,500,000
Term loan amount outstanding		308,700,000		308,700,000
Senior Subordinated Notes, 5.875 Percent, Due November 2021
Long-term Debt
Loss on early extinguishment of debt					$ 21,100,000
Amount of debt extinguished			$ 300,000,000
Interest rate (as a percent)			5.875%
Senior Unsecured Notes 5.625 Percent Due January 15, 2027
Long-term Debt
Principal amount	$ 400,000,000	$ 400,000,000		$ 400,000,000
Interest rate (as a percent)	5.625%	5.625%		5.625%
Percentage of principal amount at which the entity may redeem notes from net proceeds raised in connection with an equity offering	105.625%
Percentage of the aggregate principal amount of the notes originally issued which must remain outstanding at redemption under terms of the notes	60.00%
Period from completion of equity offering, during which notes can be redeemed	180 days
Minimum \| Term Loan A Facility
Long-term Debt
Variable interest rate spread (as a percent)	1.25%
Maximum \| Term Loan A Facility
Long-term Debt
Variable interest rate spread (as a percent)	3.00%