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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |
U.S. tax rate | 21.00% | 21.00% | 35.00%
Accrual withhilding taxes, percent | 5.00% |  |
Unrecognized tax benefits that would impact the effective tax rate |  |  |
Accrued interest and penalties, net of Federal benefit | 0 |  |
Accrued interest and penalties | 0 | $ 0 |
Deferred tax assets, valuation allowance | 12,997,000 | 9,309,000 |
Foreign tax credits | 186,706,000 | 167,685,000 |
US NOL carryforward | $ 19,027,000 |  |
NOL carryforward expiration | Dec. 31, 2038 |  |
Expense (benefit) from TCJA |  | (28,411,000) |
Minimum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit carryforward expiration | Jan. 01, 2020 |  |
Maximum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax credit carryforward expiration | Dec. 31, 2029 |  |
ASU 2016-02 [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax benefits related to restricted stock vestings and stock options exercises | $ 3,357,000 | 3,453,000 | $ 6,951,000
Tax benefits related to payment of dividends on restricted stock | 484,000 | 403,000 | 626,000
Tax Cut and Jobs Act [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax expense |  |  | 8,246,000
Accrual withholding taxes |  |  | 8,246,000
Her Majestys Revenue And Customs H M R C [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Foreign NOL carryforward | 10,160,000 |  |
Canada Revenue Agency [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Foreign NOL carryforward | $ 2,511,000 |  |
NOL carryforward expiration | Dec. 31, 2035 |  |
Foreign Country [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax expense |  |  |
Additional income tax benefit resulting from correction, amount | 2,509,000 | 3,127,000 | 2,982,000
IRS audit, additional income tax expense |  |  |
Deferred tax assets, valuation allowance | 12,671,000 | $ 9,309,000 |
Tax Year 2014 [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net refund | (34,972,000) |  |
Interest on net refund | 2,421,000 |  |
Tax Year 2015 [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net refund | (1,519,000) |  |
Interest on net refund | 978,000 |  |
Tax Year 2016 [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Net refund | (4,685,000) |  |
Interest on net refund | $ 247,000 |  |

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