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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Undistributed earnings of foreign subsidiaries | $ 106,122 |  |  |
Unrecognized tax benefit, excluding interest and penalties | 17,287 | $ 14,517 | $ 14,018 | $ 12,028
Unrecognized tax benefits that would affect effective tax rate | 14,868 |  |  |
Amount of uncertain tax liability included in Other long-term liabilities | 14,645 | 11,397 |  |
Amount of previously unrecognized tax benefits recognized | 2,370 |  |  |
Liabilities for tax-related interest and penalties | 1,227 | $ 1,391 | $ 1,066 |
Current liabilities [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Amount of uncertain tax liability expected to be paid within one year | 3,866 |  |  |
Other long-term liabilities [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Amount of uncertain tax liability included in Other long-term liabilities | 14,645 |  |  |
Settlement and Lapse of Statute [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized tax benefits within the next 12 months | $ 3,866 |  |  |

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