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Intangible Assets and Goodwill (Goodwill Information) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | $ (5,746) |  |
Gross Carrying Amount | 226,564 | $ 138,669 |
Goodwill, Impaired, Accumulated Impairment Loss | (21,770) | (21,770) |
Net Carrying Amount | 204,794 | 116,899 | $ 116,899
MID |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | 0 |  |
Gross Carrying Amount | 66,643 | 19,905 |
Goodwill, Impaired, Accumulated Impairment Loss | 0 | 0 |
Net Carrying Amount | 66,643 | 19,905 | 19,905
RSD |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Foreign Currency Translation Gain (Loss) | (5,746) |  |
Gross Carrying Amount | 138,151 | 96,994 |
Goodwill, Impaired, Accumulated Impairment Loss | 0 | 0 |
Net Carrying Amount | 138,151 | 96,994 | $ 96,994
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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