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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Goodwill information |  |
Measurement Input, Long-term Revenue Growth Rate | 3.00% | 3.00%
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | $ 209,661 | $ 204,794
Addition to goodwill |  | 803
Goodwill impairment charge | 0 | 0
Balance at the end of the period | 207,178 | 209,661
Goodwill, Foreign Currency Translation Gain (Loss) | $ (2,483) | $ 4,064
MID |  |
Goodwill information |  |
Percentage of fair value in excess of carrying amount | 17.00% | 270.00%
Measurement Input, Discount Rate | 16.00% | 12.00%
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | $ 66,643 | $ 66,643
Addition to goodwill |  | 0
Goodwill impairment charge | 0 | 0
Balance at the end of the period | 66,643 | $ 66,643
Goodwill, Foreign Currency Translation Gain (Loss) | $ 0 |
RSD |  |
Goodwill information |  |
Percentage of fair value in excess of carrying amount | 72.00% | 155.00%
Measurement Input, Discount Rate | 16.50% | 16.50%
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | $ 143,018 | $ 138,151
Addition to goodwill |  | 803
Goodwill impairment charge | 0 | 0
Balance at the end of the period | 140,535 | 143,018
Goodwill, Foreign Currency Translation Gain (Loss) | (2,483) | 4,064
Other |  |
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | 0 |
Balance at the end of the period | $ 0 | $ 0

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