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Property And Equipment (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Property And Equipment [Abstract]        
Depreciation and amortization expense $ 4,691 $ 3,456 $ 9,400 $ 6,492