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Revenue Recognition (Costs to Obtain a Contract) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]        
Deferred commission costs $ 8,894 $ 8,894 $ 11,800 $ 0
Commissions expense recognized 800 2,700    
Capitalized Contract Cost, Net $ 13,300 $ 13,300    
Minimum        
Disaggregation of Revenue [Line Items]        
Amortization period   3 years    
Maximum        
Disaggregation of Revenue [Line Items]        
Amortization period   7 years