Debt Debt - Senior Secured Credit Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Debt Instrument
Secured Debt	$ 700,000
Unamortized discount and debt issuance costs	11,137	$ 9,470
Long-term Debt, Gross	950,000	683,850
Line of Credit Facility, Maximum Borrowing Capacity	$ 300,000
Line of Credit Facility, Commitment Fee Percentage	0.20%
Prepayment Premium Rate on Term Loans	1.00%
Prepayment % of annual excess cash flow	50.00%
Prepayment % for asset sales and casualty events	100.00%
Line of Credit Facility, Expiration Date	Nov. 06, 2023
Letters of Credit Outstanding, Amount	$ 200
Debt Instrument, Covenant Description	If at any time, commencing with the fiscal quarter ending March 31, 2019, the Company has revolving borrowings, unreimbursed letter of credit drawings and undrawn letters of credit outstanding in an amount in excess of 35.0% of the commitment amount under the New Revolving Facility, the Credit Agreement requires the Company to maintain a secured net leverage ratio of at least 3.25 to 1.0.
Debt Instrument, Covenant Compliance	The Company is in compliance with all of the above covenants
Senior secured term loan facility due 2025
Debt Instrument
Unamortized discount and debt issuance costs	$ 5,100
Long-term Debt, Gross	$ 400,000	$ 0
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.52%
Debt Instrument, Frequency of Periodic Payment	quarterly
Quarterly payment percentage	0.25%
Debt Instrument, Maturity Date	Nov. 06, 2025

Debt payment percentage quarterly

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- Definition

Prepayment Premium Rate on Term Loans

+ References

No definition available.

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- Definition

Prepayment % for asset sales and casualty events

+ References

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- Definition

Prepayment % of annual excess cash flow

+ References

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.

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- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

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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

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

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

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

+ References

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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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 interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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