Investments in and Loans to Joint Ventures (Tables)

6 Months Ended

Jun. 30, 2016

Schedule of Equity Method Investments [Line Items]

Summary of financial information

	June 30, 2016		December 31, 2015
	(in thousands)
Carrying amount of investments in and loans to joint ventures
Ohio Castings	$	7,611	$	7,776
Axis	19,736		19,621
Total investments in and loans to joint ventures	$	27,347	$	27,397

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   June 30,				Six Months Ended   June 30,
	2016		2015		2016			2015
	(in thousands)
Results of operations
Revenues	$	13,683	$	20,507	$	27,337		$	43,895
Gross profit	$	1,004	$	2,314	$	1,214		$	4,362
Net earnings (loss)	$	218	$	1,397	$	(380	)	$	2,529

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   June 30,				Six Months Ended   June 30,
	2016		2015		2016		2015
	(in thousands)
Results of operations
Revenues	$	16,086	$	19,077	$	32,497	$	39,417
Gross profit	$	4,818	$	5,214	$	9,860	$	10,277
Earnings before interest	$	4,567	$	4,975	$	9,335	$	9,764
Net earnings	$	3,710	$	3,886	$	7,564	$	7,550