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Accounts and Other Receivables, Net (Tables)
 3 Months Ended
Mar. 31, 2017
Receivables [Abstract]  
Accounts and Other Receivables, Net
Net accounts and other receivables consisted of the following (in thousands):
 
 
March 31,
2017
 
December 31, 2016
Trade accounts receivable
 
$
28,850

 
$
156,705

Unbilled receivables
 
6,422

 
17,264

Advance billings
 
596

 
1,915

Short-term investment in sales-type lease
 
8,904

 
8,683

Other receivables
 
10,269

 
13,395

 
 
55,041

 
197,962

Allowance for doubtful accounts
 
(254
)
 
(21
)
Accounts and other receivables, net
 
$
54,787

 
$
197,941