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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% | 35.00%
Income Tax Expense (Benefit) | $ 143,616 | $ 127,415 | $ 118,207 |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | 1,600 |
Income Taxes Paid | 132,900 | 110,000 | 110,600 |
Operating Loss Carryforwards | 0 |  |  |
Operating Loss Carryforwards State | 36,000 |  |  |
Liability for Uncertainty in Income Taxes, Current | 300 | 200 | 200 |
Unrecognized Tax Benefits | 1,267 | $ 1,127 | $ 1,639 | $ 1,694
Foreign | Canada |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating Loss Carryforwards | $ 6,400 |  |  |
Tax Cuts and Jobs Act 2017 |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% | 35.00%
Income Tax Expense (Benefit) |  |  |  | $ 120,900
Deferred Tax Liabilities, Deferred Expense |  |  |  | 124,200
Taxes Payable |  |  |  | $ 3,300

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