Property And Equipment (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 6,176	$ 5,908	$ 18,386	$ 15,308
Impairment charges			8,590	1,111
Property And Equipment [Member]
Property, Plant and Equipment [Line Items]
Impairment charges			$ 7,069	$ 0