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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill information |  |
Terminal growth rate for key assumptions used in applying income approach | 3.00% | 3.00%
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | $ 204,794 | $ 116,899
Addition to goodwill | 803 | 93,641
Goodwill impairment charge | 0 | 0
Balance at the end of the period | 209,661 | 204,794
Goodwill, Foreign Currency Translation Gain (Loss) | $ 4,064 | $ (5,746)
MID |  |
Goodwill information |  |
Percentage of fair value in excess of carrying amount | 270.00% | 299.00%
Discount rates for key assumptions used in applying income approach | 12.00% | 12.00%
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | $ 66,643 | $ 19,905
Addition to goodwill | 0 | 46,738
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 | 155.00% | 89.00%
Discount rates for key assumptions used in applying income approach | 17.00% | 17.00%
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | $ 138,151 | $ 96,994
Addition to goodwill | 803 | 46,903
Goodwill impairment charge | 0 | 0
Balance at the end of the period | 143,018 | 138,151
Goodwill, Foreign Currency Translation Gain (Loss) | 4,064 | (5,746)
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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