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Revenue From Contracts With Customers (Disaggregation of Revenue, By Timing) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Timing of Revenue Recognition    
Total $ 345,585 $ 249,242
Goods and services transferred at a point in time    
Timing of Revenue Recognition    
Total 332,532 233,436
Goods and services transferred over time    
Timing of Revenue Recognition    
Total $ 13,053 $ 15,806