Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Outstanding Forward and Future Contracts

As of December 31, 2016, the Company had the following outstanding forward contracts with settlement dates through January 2017. There were no futures contracts outstanding at December 31, 2016.

			Notional Value
Commodity	Amount		($ in millions)
Silver	607,684	ounces	$	9.7
Gold	400	ounces	$	0.5
Copper	275,000	pounds	$	0.6
Tin	40	metric tons	$	0.8

Effect of Derivative Instruments on the Consolidated Income Statements

Effect of Derivative Instruments in the Consolidated Statements of Operations - Income/(Expense)

(in thousands)		Year Ended
		December 31,
Derivative	Statement of Operations Line	2016			2015			2014
Commodity contracts	Cost of goods sold	$	(1,520	)	$	1,467		$	2,655
	Total derivatives designated as hedging instruments	(1,520		)	1,467			2,655
Commodity contracts	Cost of goods sold	(257		)	246			131
Commodity contracts	Realized and unrealized gain on derivatives	148			588			1,307
Interest rate swap agreements	Interest expense	—			(77		)	(156		)
	Total derivatives not designated as hedging instruments	(109		)	757			1,282
	Total derivatives	$	(1,629	)	$	2,224		$	3,937

Fair Value of Derivative Instruments in the Consolidated Balance Sheets

Fair Value of Derivative Instruments on the Consolidated Balance Sheets - Asset/(Liability)

(in thousands)		December 31,			December 31,
Derivative	Balance Sheet Location	2016			2015
Commodity contracts	(Accrued liabilities)/Prepaid and other current assets	$	(111	)	$	197
	Total derivatives designated as hedging instruments	(111		)	197
Commodity contracts	Prepaid and other current assets	3			18
Interest rate swap agreements	Other non-current liabilities	—			(30		)
	Total derivatives not designated as hedging instruments	3			(12		)
	Total derivatives	$	(108	)	$	185