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New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Standards [Abstract] |  |  |  |  |
Sales incentives |  |  |  |  | $ 16,000
Capitalized contract costs | $ 16,296 | $ 16,300 | $ 16,300 |  |
Capitalized Contract Cost, Amortization |  | 4,666 | 13,260 |  |
Change in net cash provided by used in investing activities |  |  | 39,494 | $ 3,544 |
Cumulative effect adjustment from adoption of new accounting pronouncement | 13,243 | 13,243 | 13,243 |  |
Deferred tax liability | 4,058 | $ 741,300 | $ 741,300 |  | 690,767
New accounting standards, effect of change in revenue | $ 1,005 |  |  |  |
Provisional Transition Tax obligation |  |  |  |  | $ 1,000

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