Investments (Tables)

9 Months Ended

Sep. 30, 2016

Investment in Marketable Securities [Abstract]

Investments

	At September 30, 2016
In thousands	Cost		Gross Unrealized Losses			Gross Unrealized Gains		Estimated Fair Value
Kootenay Silver, Inc.	$	3,366	$	—		$	1,295	$	4,661
Silver Bull Resources, Inc.	232		—			1,175		1,407
Other	191		(51		)	—		140
Equity securities	$	3,789	$	(51	)	$	2,470	$	6,208

	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

Gross unrealized losses on investment securities

The following table summarizes the gross unrealized losses on equity securities for which other-than-temporary impairments have not been recognized and the fair values of those securities, aggregated by the length of time the individual securities have been in a continuous unrealized loss position, at September 30, 2016:

	Less than twelve months					Twelve months or more				Total
In thousands	Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses			Fair Value
Equity securities	$	(51	)	$	7	$	—	$	—	$	(51	)	$	7