Property And Equipment, Net (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense of property and equipment	$ 57,000	$ 48,800	$ 42,800
Impairment charge	8,212
Unpaid property and equipment purchases reflected within accounts payable and accrued liabilities of our consolidated balance sheets	8,500	6,500	2,200
Software Developed For Internal Use [Member]
Property, Plant and Equipment [Line Items]
Current year additions	$ 19,100	$ 11,900	$ 10,900