Fixed interest rate related to the interest rate derivative.

No definition available.

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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- Definition

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

+ References

No definition available.

+ Details

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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- Definition

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

+ References

+ Details

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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.

+ Details

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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.

+ References

+ Details

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Period Type:	instant

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the 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=118932676&loc=d3e3291-108585

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Credit Facilities (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 13, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Total of committed credit facilities with banks		$ 575,000
Borrowings outstanding		300,000	$ 125,000
Repayments of lines of credit		100,000	$ 20,000	$ 60,000
Stand-by letters of credit		32,700
Wells Fargo Bank, N.A. Mature May 14, 2024
Line of Credit Facility [Line Items]
Total of committed credit facilities with banks		$ 300,000
Committed credit facilities maturity		May 14, 2024
Borrowings outstanding		$ 75,000
Interest rate swap facility, amount		$ 75,000
Line of credit facility, interest rate		2.39%
Interest rate swap facility, fixed interest		2.32%
Interest rate swap facility, maturity date		May 14, 2024
BMO Harris Bank N.A. Mature May 14, 2024
Line of Credit Facility [Line Items]
Total of committed credit facilities with banks		$ 200,000
Committed credit facilities maturity		May 14, 2024
Borrowings outstanding		$ 75,000
Interest rate swap facility, amount		$ 75,000
Line of credit facility, interest rate		2.40%
Interest rate swap facility, fixed interest		2.36%
Interest rate swap facility, maturity date		May 14, 2024
Mature July 2013, 2020
Line of Credit Facility [Line Items]
Total of committed credit facilities with banks		$ 75,000
Committed credit facilities maturity		Jul. 13, 2020
Additional Outstanding Debt Under Credit Facilities
Line of Credit Facility [Line Items]
Borrowings outstanding		$ 150,000
Line of credit facility, interest rate		2.33%
Subsequent Event \| Wells Fargo Bank, N.A. Mature May 14, 2024
Line of Credit Facility [Line Items]
Repayments of lines of credit	$ 50,000