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Revenue Recognition (Costs to Obtain a Contract) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Deferred commission costs $ 9,890 $ 9,890 $ 9,470
Commissions expense recognized 1,100 2,300  
Capitalized Contract Cost, Net $ 14,800 $ 14,800  
Minimum      
Disaggregation of Revenue [Line Items]      
Amortization period   3 years  
Maximum      
Disaggregation of Revenue [Line Items]      
Amortization period   7 years  
Other assets      
Disaggregation of Revenue [Line Items]      
Deferred commission costs     $ 13,900