Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accrued commissions	$ 59,530	$ 115,459
Accrued compensation and employee benefits	176,204	192,367
Other accrued expenses	209,033	199,359
Total	$ 444,767	$ 507,185