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Stockholders' Investment (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of changes in stockholders' investment
Changes in stockholders’ investment for the three and six months ended June 30, 2018 and 2017 consisted of the following (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Beginning balance
$
88,538

 
$
177,940

 
$
111,733

 
$
197,468

Net loss
(41,955
)
 
(37,863
)
 
(65,598
)
 
(57,806
)
Share-based compensation
372

 
658

 
895

 
1,268

Issuance of warrants
—

 
2,571

 
—

 
2,571

Issuance of restricted stock units, net of taxes paid
(1
)
 
(20
)
 
(76
)
 
(215
)
Ending balance
$
46,954

 
$
143,286

 
$
46,954

 
$
143,286