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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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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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