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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Revenue Recognition [Abstract]    
Contract Assets, Current $ 35,913 $ 21,912
Contract Assets, Non-Current 28,013 54,232
Contract Liability, Current 3,081 2,896
Contract Liabilities, Non-Current $ 21,597 $ 23,170