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Revenue From Contracts With Customers (Changes in Contract Assets and Contract Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Contract liabilities    
Customer deposits - current $ 36,967  
Deferred revenue - current 11,307  
Deferred revenue - long-term $ 1,374  
Calculated under Revenue Guidance in Effect before Topic 606    
Contract liabilities    
Customer deposits - current   $ 36,937
Deferred revenue - current   9,571
Deferred revenue - long-term   182
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC 606    
Contract liabilities    
Customer deposits - current   $ 30
Customer deposits, Change   0.10%
Deferred revenue - current   $ 1,736
Deferred revenue - current, Change   18.10%
Deferred revenue - long-term   $ 1,192
Deferred revenue - long-term, Change   654.90%