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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash |  | $ 0 | $ 0 |  |
Capitalized costs |  | 0 | 0 | $ 0 |
Advertising costs |  | 1,400,000 | 1,500,000 | 1,800,000 |
Foreign currency gains (losses) |  | 600,000 | (1,100,000) | (3,100,000) |
Non-cash cumulative effect adjustment to retained earnings, net of tax |  | 632,795,000 | 177,825,000 | (9,233,000) | $ (53,842,000)
Reserve for contract assets and sales-type leases |  | 3,700,000 |  |  |
Accounts receivable allowance for credit losses |  | 6,800,000 | 3,600,000 |  |
Retained Earnings |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Non-cash cumulative effect adjustment to retained earnings, net of tax |  | $ 2,175,595,000 | 1,595,648,000 | $ 1,167,928,000 | 803,545,000
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) |  | (12,648,000)
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) |  | $ (12,648,000)
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 |  |

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