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Acquisitions (Tables)
 9 Months Ended
Sep. 30, 2016
Business Combinations [Abstract]  
Business Acquisition, Pro Forma Information
The following unaudited pro forma financial information is presented for informational purposes only and is not necessarily indicative of the results of operations as they would have been had the transaction occurred on the assumed date, nor is it necessarily an indication of trends in future results for a number of reasons, including, but not limited to, differences between the assumptions used to prepare the pro forma information, potential synergies, and cost savings from operating efficiencies.
 
 
Three months ended September 30,
 
Nine Months Ended September 30, 2016
In thousands
 
2016
 
2015
 
2016
 
2015 (Pro Forma)
Revenue
 
$
176,247

 
$
162,552

 
$
506,641

 
$
499,770

Income (loss) before income and mining taxes
 
15,102

 
(22,479
)
 
10,542

 
(72,688
)
Net income (loss)
 
69,557

 
(14,219
)
 
63,660

 
(64,237
)