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Interest Expense (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.20%		4.20%
Repayments of Long-term Debt			$ 110,000	$ 200,000
Accretion of original issue discount on 2018 Term Loan Facility	$ 338	$ 572	865	1,843
Amortization of debt issuance costs and modification costs	$ 932	1,337	$ 2,176	5,368
2018 Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.67%		4.67%		3.50%
Repayments of Long-term Debt	$ 40,000	50,000	$ 110,000	200,000
Accretion of original issue discount on 2018 Term Loan Facility	200	300	500	1,200
Amortization of debt issuance costs and modification costs	$ 300	$ 400	$ 800	2,000
Payments of Debt Restructuring Costs				$ 1,600
2020 Senior Secured Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%		4.625%

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Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

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Amount of amortization expense attributable to debt issuance costs.

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

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The cash outflow for cost incurred in the modification of term of existing debt agreement in order for the entity to achieve some advantage.

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