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Borrowing Facilities (Narrative) (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jul. 20, 2018
Line Of Credit Facility [Line Items] |  |  |
Credit agreement, secured by percentage of voting capital stock of each direct foreign subsidiary | 65.00% |  |
Credit Agreement [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Credit Agreement capacity |  |  | $ 650,000,000
Description of variable interest rate basis | Interest on outstanding borrowings under the Credit Agreement (other than swingline loans) accrues, at the Company’s option, at (a) the London Interbank Offered Rate (LIBOR) plus 1.0% to 2.0% or (b) the base rate plus 0.0% to 1.0%. |  |
Credit Agreement covenant terms | The Credit Agreement contains certain financial covenants related to interest coverage and debt leverage, and certain customary affirmative and negative covenants, including restrictions on the Company’s ability to incur additional debt and liens, pay dividends, repurchase shares, sell assets and merge or consolidate with other persons. Amounts due under the Credit Agreement could be accelerated upon specified events of default, including a failure to pay amounts due, breach of a covenant, material inaccuracy of a representation, or occurrence of bankruptcy or insolvency, subject, in some cases, to cure periods. |  |
Credit Agreement [Member] | Minimum [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
U.S. Credit facility, commitment fee | 0.20% |  |
Credit Agreement [Member] | Minimum [Member] | LIBOR Plus [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
U.S. Credit facility, commitment fee | 1.00% |  |
Credit Agreement [Member] | Minimum [Member] | Alternate Base Rate Plus [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
U.S. Credit facility, commitment fee | 0.00% |  |
Credit Agreement [Member] | Maximum [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
U.S. Credit facility, commitment fee | 0.30% |  |
Credit Agreement [Member] | Maximum [Member] | LIBOR Plus [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
U.S. Credit facility, commitment fee | 2.00% |  |
Credit Agreement [Member] | Maximum [Member] | Alternate Base Rate Plus [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
U.S. Credit facility, commitment fee | 1.00% |  |
Credit Agreement [Member] | Bank Of America Credit Agreement [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Credit Agreement description | On July 20, 2018, the Company entered into a $650 million credit agreement (the Credit Agreement) by and among the Company, certain of its subsidiaries, the lenders party thereto and Bank of America, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer. The Credit Agreement is comprised of a five-year $500 million revolving credit facility (the Revolving Credit Facility) and a five-year $150 million term loan facility (the Term Loan Facility), both with a maturity date of July 20, 2023. The Revolving Credit Facility is available for general corporate purposes. The Credit Agreement includes an accordion feature pursuant to which the Company is permitted to add one or more incremental term loan and/or increase commitments under the Revolving Credit Facility in an aggregate amount not exceeding $275 million, subject to the satisfaction of certain conditions. |  |
Revolving Credit Facility [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Credit Agreement capacity |  |  | 500,000,000
Term period | 5 years |  |
Credit Agreement maturity date | Jul. 20, 2023 |  |
Possible increase to total commitments under Credit Agreement | $ 275,000,000 |  |
Revolving credit facility, available for future borrowings | 496,100,000 |  |
Letters of credit outstanding amount | $ 3,900,000 |  |
Term Loan Facility [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Term period | 5 years |  |
Credit Agreement maturity date | Jul. 20, 2023 |  |
Term Loan proceeds |  |  | $ 150,000,000
Term Loan frequency of periodic payments | quarterly |  |
Derivative Notional Amount | $ 133,100,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.928% |  |
Principal amount | $ 133,124,000 | $ 136,874,000 |
Term Loan Facility [Member] | Interest Rate Swap [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Derivative Notional Amount | 133,100,000 |  |
Term Loan Facility [Member] | Bank Of America Credit Agreement [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Quarterly principal installments | $ 1,900,000 |  |

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