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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
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 | $ 116,899 | $ 116,899
Addition to goodwill | 93,641 | 0
Goodwill impairment charge | 0 | 0
Balance at the end of the period | 204,794 | $ 116,899
MID |  |
Goodwill information |  |
Fair value of goodwill | $ 66,643 |
Percentage of fair value in excess of carrying amount | 299.00% | 226.00%
Discount rates for key assumptions used in applying income approach | 12.00% | 13.00%
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | $ 19,905 | $ 19,905
Addition to goodwill | 46,738 | 0
Goodwill impairment charge | 0 | 0
Balance at the end of the period | 66,643 | $ 19,905
RSD |  |
Goodwill information |  |
Fair value of goodwill | $ 138,151 |
Percentage of fair value in excess of carrying amount | 89.00% | 45.00%
Discount rates for key assumptions used in applying income approach | 17.00% | 20.00%
Goodwill information for each reporting unit |  |
Balance at the beginning of the period | $ 96,994 | $ 96,994
Addition to goodwill | 46,903 | 0
Goodwill impairment charge | 0 | 0
Balance at the end of the period | 138,151 | 96,994
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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