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Intangible Assets and Goodwill (Goodwill Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)	$ (2,483)	$ 4,064
Gross Carrying Amount	228,948	231,431
Goodwill, Impaired, Accumulated Impairment Loss	(21,770)	(21,770)
Net Carrying Amount	207,178	209,661	$ 204,794
MID
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)	0
Gross Carrying Amount	66,643	66,643
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Net Carrying Amount	66,643	66,643	66,643
RSD
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)	(2,483)	4,064
Gross Carrying Amount	140,535	143,018
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Net Carrying Amount	140,535	143,018	$ 138,151
Other
Goodwill [Line Items]
Gross Carrying Amount	21,770	21,770
Goodwill, Impaired, Accumulated Impairment Loss	(21,770)	(21,770)
Net Carrying Amount	$ 0	$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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