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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  |  | $ 749,678 |  | $ 698,496 |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | us-gaap:AccountingStandardsUpdate201602Member | us-gaap:AccountingStandardsUpdate201613Member |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Accounts and financing receivable, allowance for credit loss |  |  |  | $ 1,800 |  |
Retained earnings |  |  |  | $ (1,400) |  | $ 100

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