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Long-Term Debt (Details of the Company's Credit Agreement) (Details) - Credit Agreement [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Available	$ 933,775	$ 1,238,937
Commitment - rate applicable	0.09%	0.15%
Long-term Debt	$ 803,944	$ 203,927
US Swing Line Loan [Member]
Line of Credit Facility [Line Items]
Interest rate applicable	3.25%
Margin rate for loans	0.00%
Long-term Debt	$ 11,000
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Letter of credit	$ 112,281	$ 119,636
Base Rate [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate applicable	3.25%
Margin rate for loans	0.00%
Long-term Debt	$ 158,000
LIBOR [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate applicable	1.10%	1.35%
Margin rate for loans	1.00%	1.20%
Long-term Debt	$ 631,000	$ 200,000
LIBOR [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Interest rate applicable	1.10%	1.35%
Margin rate for loans	1.00%	1.20%
Long-term Debt	$ 650,000	$ 650,000
Canadian Bankers Acceptance Loan [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate applicable	1.45%	1.66%
Margin rate for loans	1.00%	1.20%
Long-term Debt	$ 3,944	$ 3,927

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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-Name Accounting Standards Codification
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X

- 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.

+ References

No definition available.

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- Definition

The effective interest rate at the end of the reporting period.

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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

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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