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Contract Assets (Schedule Of Changes) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Change In Contract With Customer Asset [Abstract]    
Transferred to receivables from contract assets recognized at the beginning of the period $ (145,217) $ (156,206)
Contract assets recognized, net of reclassification to accounts receivable 146,344 149,645
Net change $ 1,127 $ (6,561)