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Property And Equipment (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Depreciation expense $ 24,331 $ 20,979 $ 14,727
Impairment charges 8,618 544,611  
Property, Plant and Equipment [Member]      
Impairment charges $ 7,408 $ 614 $ 0