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Long-Term Debt And Lines of Credit (Narrative) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 20, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 02, 2019
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing amount |  |  |  | $ 450,000,000
2018 Credit Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Standby letters of credit issued |  | $ 37,900,000 |  |
2018 Credit Agreement [Member] | LIBOR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 1.00% | 1.00% |
2018 Credit Agreement [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility period, years | 5 years |  |  |
Borrowing amount | $ 450,000,000 |  |  |
Deferred financing costs |  | $ 1,000,000.0 |  |
Unused lines of credit |  | $ 322,100,000 |  |
2018 Credit Agreement [Member] | Expansion Feature [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowing amount | $ 150,000,000 |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + 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 Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section S45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336 + Details
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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 Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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