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Property And Equipment (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property And Equipment [Abstract]        
Depreciation expense $ 5,908 $ 3,828 $ 15,308 $ 10,320