Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Restricted cash		$ 0	$ 0
Capitalized costs		0	0	$ 0
Advertising costs		3,300,000	1,400,000	1,500,000
Foreign currency gains (losses)		(2,100,000)	600,000	(1,100,000)
Non-cash cumulative effect adjustment to retained earnings, net of tax		689,992,000	632,795,000	177,825,000	$ (9,233,000)
Reserve for contract assets and sales-type leases		4,400,000	3,700,000
Accounts receivable allowance for credit losses		5,700,000	6,800,000
Retained Earnings
Summary Of Significant Accounting Policies [Line Items]
Non-cash cumulative effect adjustment to retained earnings, net of tax		$ 2,920,440,000	$ 2,175,595,000	1,595,648,000	$ 1,167,928,000
Accounting Standards Update 2016-13
Summary Of Significant Accounting Policies [Line Items]
Reserve for contract assets and sales-type leases	$ 2,300,000
Accounts receivable allowance for credit losses	200,000
Accounting Standards Update 2016-13 | Retained Earnings
Summary Of Significant Accounting Policies [Line Items]
Non-cash cumulative effect adjustment to retained earnings, tax	$ 600,000
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Non-cash cumulative effect adjustment to retained earnings, net of tax				(1,829,000)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Summary Of Significant Accounting Policies [Line Items]
Non-cash cumulative effect adjustment to retained earnings, net of tax				(1,829,000)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Retained Earnings
Summary Of Significant Accounting Policies [Line Items]
Non-cash cumulative effect adjustment to retained earnings, net of tax				$ 1,800,000