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Nature Of Business And Summary Of Significant Accounting Policies (Cumulative Effect of Change to Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Prepaid income taxes | $ 43,782 | $ 43,741 | $ 44,944
Deferred income tax assets | 19,165 | 28,150 | 26,976
Customer deposits and deferred revenue (short-term) |  | 46,508 |
Income taxes payable | 51,161 | 15,810 | 15,773
Deferred income tax liabilities |  | 21,496 |
Retained earnings | 1,848,500 | 1,444,473 | 1,443,867
Accumulated other comprehensive loss | $ (162,896) | (77,334) | (77,344)
Before Adoption of Standard |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Prepaid income taxes |  |  | 44,944
Deferred income tax assets |  |  | 26,976
Customer deposits and deferred revenue (short-term) |  |  | 47,324
Income taxes payable |  |  | 15,773
Deferred income tax liabilities |  |  | 21,362
Retained earnings |  |  | 1,443,867
Accumulated other comprehensive loss |  |  | $ (77,344)
ASC 606 | Adoption of Standard |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred income tax assets |  | (55) |
Customer deposits and deferred revenue (short-term) |  | (816) |
Income taxes payable |  | 37 |
Deferred income tax liabilities |  | 134 |
Retained earnings |  | 590 |
ASU 2018-02 | Adoption of Standard |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings |  | (10) |
Accumulated other comprehensive loss |  | 10 |
ASU 2016-16 | Adoption of Standard |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Prepaid income taxes |  | (1,203) |
Deferred income tax assets |  | 1,229 |
Retained earnings |  | $ 26 |

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