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v3.20.4

Long-term Debt (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) maximumNumberOfLeverage | Dec. 31, 2019 USD ($) | Dec. 31, 2012 USD ($) | Dec. 20, 2012
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 598,848,000 | $ 642,941,000 |  |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Financing costs incurred | 2,500,000 |  |  |
Maximum borrowing capacity | 900,000,000 |  |  |
Increase in aggregate amount of revolving credit facility allowed | 425,000,000 |  |  |
Line of Credit Facility Financing Costs Carried Over | $ 1,200,000 |  |  |
Debt Instrument, Term | 5 years |  |  |
Average interest rate during period | 1.40% | 3.00% |  |
Long-term debt | $ 0 | $ 44,678,000 |  |
Outstanding letters of credit | 2,000,000 | 3,000,000 |  |
Unused portion of revolving credit facility | 898,000,000 | $ 803,000,000 |  |
Payments of Financing Costs | $ 1,300,000 |  |  |
Basis spread on NYFRB rate | 0.50% |  |  |
Basis spread on adjusted LIBO rate | 1.00% |  |  |
MaximumLeverageRatio | maximumNumberOfLeverage | 3.75 |  |  |
Revolving Credit Facility [Member] | Letters of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 50,000,000 |  |  |
Revolving Credit Facility [Member] | Multicurrency Borrowings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | 500,000,000 |  |  |
Revolving Credit Facility [Member] | Swingline Loans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 20,000,000 |  |  |
Revolving Credit Facility [Member] | Loans Bearing Interest Based On ABR [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate Description | 0.000 |  |  |
Revolving Credit Facility [Member] | Loans Bearing Interest Based On ABR [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate Description | 0.375 |  |  |
Revolving Credit Facility [Member] | Loans Bearing Interest Based On Adjusted LIBO Rate [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate Description | 0.875 |  |  |
Revolving Credit Facility [Member] | Loans Bearing Interest Based On Adjusted LIBO Rate [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate Description | 1.375 |  |  |
4.10% Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt issued | $ 350,000,000 |  |  |
Senior notes, interest rate | 4.10% | 4.10% |  |
Senior notes issue price |  |  |  | 99.83%
Financing costs incurred |  |  | $ 5,000,000 |
Long-term debt | $ 348,848,000 | $ 348,263,000 |  |
3.78% Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt issued | $ 250,000,000 |  |  |
Senior notes, interest rate | 3.78% | 3.78% |  |
Annual principal payments beginning January 4, 2025 | $ 50,000,000 |  |  |
Long-term debt | $ 250,000,000 | $ 250,000,000 |  |

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- Definition The potential increase to the aggregate borrowings permitted under the line of credit facility as a result of an expansion feature, which allows the entity, under certain conditions, to request an increase in the borrowing limit. + References No definition available. + Details
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- Definition Represents the portion of unamortized deferred costs related to a previous line of credit facility that has been modified or exchanged which may continue to be deferred and amortized. These cost are amortized over the term of the new arrangement. + References No definition available. + Details
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