Investments in and Loans to Joint Ventures (Tables)

3 Months Ended

Mar. 31, 2017

Schedule of Equity Method Investments [Line Items]

Summary of financial information

	March 31, 2017		December 31, 2016
	(in thousands)
Carrying amount of investments in and loans to joint ventures
Ohio Castings	$	6,665	$	7,477
Axis	18,720		18,855
Total investments in and loans to joint ventures	$	25,385	$	26,332

Ohio Castings [Member]

Schedule of Equity Method Investments [Line Items]

Summary of financial information

Summary financial results for Ohio Castings, the investee company, in total, are as follows:

	Three Months Ended   March 31,
	2017			2016
	(in thousands)
Results of operations
Revenues	$	4,449		$	13,654
Gross profit (loss)	$	(1,980	)	$	210
Net loss	$	(2,434	)	$	(598	)

Axis [Member]

Schedule of Equity Method Investments [Line Items]

Summary of financial information

Summary financial results for Axis, the investee company, in total, are as follows:

	Three Months Ended   March 31,
	2017		2016
	(in thousands)
Results of operations
Revenues	$	14,366	$	16,411
Gross profit	$	4,206	$	5,042
Earnings before interest	$	4,003	$	4,768
Net earnings	$	3,331	$	3,854