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Long-Term Debt - Senior Notes Net Interest Expense (Details) - Senior Notes - 6.125% Senior Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest Expense and Amortization of Debt Issue Costs
Interest expense	$ 8,715	$ 8,697	$ 17,426	$ 17,390
Debt issue cost amortization	321	321	642	642
Debt discount amortization	293	275	582	546
Total	$ 9,329	$ 9,293	$ 18,650	$ 18,578

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Amount of amortization expense attributable to debt issuance costs.

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Represents the charge against earnings during the period for commitment fees and debt issuance expenses.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Aggregate amount of interest paid or due on all long-term debt.

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