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Changes in Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Asset associated with future estimated variable consideration | $ 9,200 | $ 9,200 |
Increase (decrease) in retained earnings | $ 1,109,017 |  | $ 922,662
Accounting Standards Update, 2014-09, Future Estimated Variable Consideration |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Asset associated with future estimated variable consideration |  | 9,200 |
Increase (decrease) in retained earnings |  | 6,500 |
Accounting Standards Update, 2014-09, Determination And Capitalization Of Direct Costs Incurred |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Increase (decrease) in retained earnings |  | (5,100) |
Reduction in prepaid commissions |  | $ 7,200 |

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