Intangible Assets and Goodwill (Goodwill Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)	$ (5,746)
Gross Carrying Amount	226,564	$ 138,669
Goodwill, Impaired, Accumulated Impairment Loss	(21,770)	(21,770)
Net Carrying Amount	204,794	116,899	$ 116,899
MID
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)	0
Gross Carrying Amount	66,643	19,905
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Net Carrying Amount	66,643	19,905	19,905
RSD
Goodwill [Line Items]
Goodwill, Foreign Currency Translation Gain (Loss)	(5,746)
Gross Carrying Amount	138,151	96,994
Goodwill, Impaired, Accumulated Impairment Loss	0	0
Net Carrying Amount	138,151	96,994	$ 96,994
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