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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Revenue Recognition [Abstract]    
Contract Assets, Current $ 21,912 $ 0
Contract Assets, Non-Current [1] 54,232 72,241
Contract Liabilities, Current 2,896 0
Contract Liabilities, Non-Current $ 23,170 $ 26,271
[1] See Revenue Recognition (Note 3) for discussion on the circumstances that result in the recognition of contract assets.