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Intangible Assets and Goodwill (Goodwill Information) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | $ (2,483) | $ 4,064 |
Gross Carrying Amount | 228,948 | 231,431 |
Goodwill, Impaired, Accumulated Impairment Loss | (21,770) | (21,770) |
Net Carrying Amount | 207,178 | 209,661 | $ 204,794
MID |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | 0 |  |
Gross Carrying Amount | 66,643 | 66,643 |
Goodwill, Impaired, Accumulated Impairment Loss | 0 | 0 |
Net Carrying Amount | 66,643 | 66,643 | 66,643
RSD |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | (2,483) | 4,064 |
Gross Carrying Amount | 140,535 | 143,018 |
Goodwill, Impaired, Accumulated Impairment Loss | 0 | 0 |
Net Carrying Amount | 140,535 | 143,018 | $ 138,151
Other |  |  |
Goodwill [Line Items] |  |  |
Gross Carrying Amount | 21,770 | 21,770 |
Goodwill, Impaired, Accumulated Impairment Loss | (21,770) | (21,770) |
Net Carrying Amount | $ 0 | $ 0 |

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