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Long-Term Trade And Unbilled Receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Billed and Unbilled Contract Claims Subject to Uncertainty [Abstract]  
Schedule Of Long-Term Trade And Unbilled Receivables
 
December 31,
 
2017
 
2016
Receivables
$
63,833

 
$
—

Unbilled receivables
231,563

 
189,688

 
$
295,396

 
$
189,688