Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Assets and liabilities that are measured at fair value on a recurring basis

The following tables summarize the Company's assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2016 and 2015:

	Asset (Liability) as of December 31, 2016
(in thousands)	Total			Level 1		Level 2			Level 3
Investment in associated company	$	12,318		$	12,318	$	—		$	—
Precious metal and commodity inventories recorded at fair value	$	10,143		$	10,143	$	—		$	—
Commodity contracts on precious metal and commodity inventories	$	(108	)	$	—	$	(108	)	$	—

	Asset (Liability) as of December 31, 2015
(in thousands)	Total			Level 1		Level 2			Level 3
Investment in associated company	$	20,923		$	20,923	$	—		$	—
Precious metal and commodity inventories recorded at fair value	$	10,380		$	10,380	$	—		$	—
Commodity contracts on precious metal and commodity inventories	$	215		$	—	$	215		$	—
Interest rate swap agreements	$	(30	)	$	—	$	(30	)	$	—