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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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) | $ 71,198,000 | $ 89,526,000 | $ (331,223,000) |
Net refund | 16,287,000 |  |  |
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 | 28,805,000 | 12,997,000 |  |
Foreign tax credits | 46,109,000 | 186,706,000 |  |
Expense (benefit) from TCJA |  |  | (28,411,000) |
ASU 2016-09 [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Tax benefits related to restricted stock vestings and stock options exercises | 2,993,000 | 3,357,000 | 3,453,000 |
Tax benefits related to payment of dividends on restricted stock | 583,000 | 484,000 | 403,000 |
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 | 46,109,000 |  |  |
Her Majestys Revenue And Customs H M R C [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | 26,428,000 |  |  |
Swiss Federal Tax Administration F T A [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | $ 2,317,000 |  |  |
Net operating loss carryforwards, expiration | Dec. 31, 2028 |  |  |
Canada Revenue Agency [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | $ 1,774,000 |  |  |
Net operating loss carryforwards, expiration | Dec. 31, 2035 |  |  |
Revenue Commissioners Ireland [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | $ 2,300,000 |  |  |
Internal Revenue Service I R S [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | $ 684,000 |  |  |
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 |  |  |
Foreign Country [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax expense (benefit) | 432,000 | $ 14,323,000 | $ 6,400,000 |
Tax Year 2015 [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net refund | 1,519,000 |  |  |
Tax Year 2016 [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net refund | $ 4,685,000 |  |  |

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