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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Foreign derived intangible income deduction benefit provided by the Tax Act |  | $ 1,206 |  |  |
Foreign withholding tax included in Deferred income taxes | $ 3,199 | 312 | $ 3,199 |  |
Tax benefit from remeasurement of estimated net deferred tax liability |  |  | 27,153 |  |
Tax expense (benefit) from preliminary estimate of one-time transition tax and withholding tax |  |  | 14,743 |  |
Net tax benefit from enactment of the Tax Act | $ 12,410 |  |  |  |
Net tax benefit from enactment of the Tax Act, per diluted share | $ 0.08 |  |  |  |
One-time transition tax on repatriation of previously deferred foreign earnings |  | 10,711 |  |  |
Payment of transition tax |  | 1,000 |  |  |
Overpayment of federal taxes against the transition tax payable |  | 8,908 |  |  |
Transition tax, noncurrent |  | 803 |  |  |
Unrecognized tax benefit, excluding interest and penalties | $ 14,480 | 14,367 | 14,480 | $ 17,287 | $ 14,517
Unrecognized tax benefits that would affect effective tax rate |  | 13,774 |  |  |
Amount of previously unrecognized tax benefits recognized |  | 2,621 |  |  |
Liabilities for tax-related interest and penalties |  | 1,289 | $ 1,175 | $ 1,227 |
Current liabilities |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Amount of uncertain tax liability expected to be paid within one year |  | 3,131 |  |  |
Other long-term liabilities |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Amount of uncertain tax liability included in Other long-term liabilities |  | 12,525 |  |  |
Settlement and Lapse of Statute |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Unrecognized tax benefits within the next 12 months |  | $ 3,131 |  |  |

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