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Financial Statement Information Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Depreciation $ 34,000 $ 30,000 $ 93,000 $ 84,000  
Property and equipment, net $ 867,972   $ 867,972   $ 811,576