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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |
Accrual withholding taxes, percent | 5.00% |  |  |
Income tax rate | 21.00% | 21.00% | 21.00% | 35.00%
Income tax expense (benefit) | $ 166,538,000 | $ 71,198,000 | $ 89,526,000 |
Net refund | 16,300,000 |  |  |
Unrecognized tax benefits that would impact the effective tax rate |  |  |  |
Accrued interest and penalties, net of Federal benefit | 0 |  |  |
Accrued interest and penalties |  | 0 |  |
Deferred tax assets, valuation allowance | 17,765,000 | 28,805,000 |  |
Foreign tax credits | 30,885,000 | 31,989,000 |  |
ASU 2016-09 [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax benefits related to restricted stock vestings and stock options exercises | 2,200,000 | 3,000,000.0 | 3,500,000 |
Tax benefits related to payment of dividends on restricted stock | 611,000 | 583,000 | 484,000 |
CARES Act [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense (benefit) | 32,500,000 |  |  |
Net refund | 182,500,000 |  |  |
Subsequent to CARES Act [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Foreign tax credits |  | 46,100,000 |  |
Her Majestys Revenue And Customs H M R C [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | 16,700,000 |  |  |
Swiss Federal Tax Administration F T A [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | $ 2,500,000 |  |  |
Net operating loss carryforwards, expiration | Dec. 31, 2028 |  |  |
Canada Revenue Agency [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards, expiration | Dec. 31, 2035 |  |  |
Revenue Commissioners Ireland [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | $ 200,000 |  |  |
Internal Revenue Service I R S [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | $ 800,000 |  |  |
Net operating loss carryforwards, expiration | Dec. 31, 2037 |  |  |
Internal Revenue Service I R S [Member] | Subsequent to CARES Act [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | $ 0 |  |  |
Tax credit carryforward expiration | Dec. 31, 2028 |  |  |
Foreign Country [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense (benefit) | $ 5,065,000 | $ 432,000 | $ 14,323,000 |
Increase (decrease) in valuation allowance | (11,000,000.0) |  |  |
Tax Year 2015 [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net refund | 1,500,000 |  |  |
Tax Year 2016 [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net refund | $ 4,700,000 |  |  |

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