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Other Non-Current Liabilities Other Current Assets (Tables) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Other Current Assets - Components of Other Current Assets [Line Items]      
Unbilled Receivables, Current $ 21,006   $ 3,538
Other Assets, Miscellaneous, Current 6,632   8,082
Other Assets, Current $ 27,638 $ 26,309 $ 11,620
Other Current Assets [Text Block]
The components of other current assets are as follows:
 
June 30,
2018
 
December 31,
2017
Contract assets
$
21,006

 
$
3,538

Other
6,632

 
8,082

Total other current assets
$
27,638

 
$
11,620