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Revenue From Contracts With Customers (Changes in Contract Assets and Contract Liabilities) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Contract assets        
Contract assets $ 6,771 $ 10,606 $ 9,645 $ 10,102
Contract assets, change (2,874) 504    
Contract liabilities        
Contract liabilities - current 57,034 49,358 59,531 52,606
Contract liabilities - current, change (2,497) (3,248)    
Contract liabilities - long-term 2,121 1,677 $ 1,820 $ 1,413
Contract liabilities - long-term, change $ 301 $ 264