Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investment in Marketable Securities [Abstract]

Investments

	At December 31, 2016
In thousands	Cost		Gross Unrealized Losses		Gross Unrealized Gains		Estimated Fair Value
Kootenay Silver, Inc.	$	2,645	$	—	$	—	$	2,645
Silver Bull Resources, Inc.	233		—		783		1,016
Other	229		—		598		827
Equity securities	$	3,107	$	—	$	1,381	$	4,488

	At December 31, 2015
In thousands	Cost		Gross Unrealized Losses			Gross Unrealized Gains		Estimated Fair Value
Paramount Gold Nevada Corp.	$	1,470	$	(1,036	)	$	—	$	434
Northair Silver Corp.	725		—			9		734
Agnico-Eagle Mines Ltd.	420		—			518		938
Silver Bull Resources, Inc.	305		—			—		305
Other	466		(143		)	32		355
Equity securities	$	3,386	$	(1,179	)	$	559	$	2,766