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Accounting Policies (Details) - USD ($) $ in Thousands |  | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |
Non-cash cumulative effect adjustment to retained earnings, net of tax |  | $ 441,115 | $ 273,400 | $ 108,055 | $ 177,825 | $ 202,722 | $ 171,549 | $ 51,870 | $ (9,233)
Reserve for contract assets and sales-type leases |  | 3,300 |  |  |  |  |  |  |
Accounts receivable allowance for credit losses |  | 6,600 |  |  | 3,600 |  |  |  |
Cumulative effect of accounting changes (Note 2) |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Non-cash cumulative effect adjustment to retained earnings, net of tax |  |  |  |  | (1,829) |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Reserve for contract assets and sales-type leases | $ 2,300 |  |  |  |  |  |  |  |
Accounts receivable allowance for credit losses | 200 |  |  |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Non-cash cumulative effect adjustment to retained earnings, net of tax |  | $ 2,000,805 | $ 1,854,586 | $ 1,705,646 | 1,595,648 | $ 1,505,152 | $ 1,396,315 | $ 1,270,609 | $ 1,167,928
Retained Earnings | Cumulative effect of accounting changes (Note 2) |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Non-cash cumulative effect adjustment to retained earnings, net of tax |  |  |  |  | (1,829) |  |  |  |
Retained Earnings | Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Non-cash cumulative effect adjustment to retained earnings, tax | $ 600 |  |  |  |  |  |  |  |
Retained Earnings | Accounting Standards Update 2016-13 | Cumulative effect of accounting changes (Note 2) |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Non-cash cumulative effect adjustment to retained earnings, net of tax |  |  |  |  | $ 1,800 |  |  |  |

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