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Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	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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