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Other Current Assets
 6 Months Ended
Jun. 30, 2016
Assets, Current [Abstract]  
Other Current Assets
Other Current Assets
Other current assets consist of the following:
 
June 30, 2016
 
December 31, 2015
 
(in thousands)
Prepaid expenses
$
25,821

 
$
14,144

Other current assets
2,558

 
1,725

Assets held for sale
6,352

 
1,698

Total
$
34,731

 
$
17,567