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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Summary of Contract Liability
The following table presents a rollforward of the Franco-Nevada contract liability balance:
 
Three months ended March 31,
In thousands
2018
 
2017
Opening Balance
$
14,883

 
$
19,281

Revenue Recognized
(543
)
 
$
(1,629
)
Closing Balance
$
14,340

 
$
17,652