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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Interest expense related to uncertain tax positions | $ 554 | $ 1,853 | $ 536 |
Interest on income taxes accrued | 2,185 | 3,054 |  |
Lapsing of statutes of limitations | $ 3,186 | $ 209 | $ 328 |
Statutory U.S. federal income tax rate | 21.00% | 21.00% | 21.00% | 35.00%
Income tax expense/(benefit) from tax rate change | $ 110,765 |  |  |
Deferment of employer-paid social security taxes | 70,812 |  |  |
CARES Act to QIP, acceleration of depreciation expenses | $ 60,376 |  |  |
Impact to tax rate | 0.00% |  |  |
CARES Act, employee retention credits | $ 3,403 |  |  |
TCJA cumulative tax adjustments |  |  | $ 6,446 |
Canada [Member] |  |  |  |
CARES Act, employee retention credits | 2,028 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Gross NOLS | 98,710 | $ 68,169 |  |
Valuation allowances of deferred tax assets | 104,820 | 77,191 |  |
State and Local Jurisdiction [Member] |  |  |  |
Gross NOLS | 340,259 | $ 0 |  |
Domestic Tax Authority [Member] |  |  |  |
Lapsing of statutes of limitations | $ 6,316 |  |  |

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