Intangible Assets and Goodwill (Goodwill Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Gross Carrying Amount	$ 205,235	$ 228,948
Goodwill, Written off Related to Sale of Business Unit	54,494
Goodwill, Foreign Currency Translation Gain (Loss)	459	(2,483)
Goodwill, Impaired, Accumulated Impairment Loss	(21,770)	(21,770)
Net Carrying Amount	$ 183,465	$ 207,178	$ 209,661