Goodwil And Intangible Assets, Net (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets, Net [Abstract]
Goodwill, Impairment Loss	$ 0	$ 0	$ 0
Aggregate amortization expense	9,500,000	$ 10,400,000	$ 9,800,000
Non-cash intangible asset impairments	$ 2,200,000