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Stockholders' Investment (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Schedule of changes in stockholders' investment
Changes in stockholders’ investment for the three months ended March 31, 2017 and 2016 consisted of the following (in thousands):
 
 
Three Months Ended
 
 
March 31,
 
 
2017
 
2016
Beginning balance
 
$
197,468

 
$
556,439

Net (loss) income
 
(19,943
)
 
900

Share-based compensation
 
610

 
549

Issuance of restricted stock units, net of taxes paid
 
(195
)
 
(164
)
Tax deficiency on share-based compensation
 
—

 
(253
)
Ending balance
 
$
177,940

 
$
557,471