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Debt:2030 Notes (Details) - USD ($) $ in Thousands	1 Months Ended	5 Months Ended	12 Months Ended
	Jul. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016
Debt Instrument [Line Items]
Repayments of Long-term Debt			$ 405,774	$ 5,500	$ 7,500
Term Loan Due 2026 [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 45,000					$ 30,000
4.875% Senior Notes Due 2030 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Dividend restriction, interest coverage ratio (as a percent)		350.00%

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- Definition

Minimum interest coverage ratio. If that percentage is met, there is no restriction upon the payment of dividends.

+ 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.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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