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