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Investments in and Loans to Joint Ventures (Tables)
 6 Months Ended
Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]  
Summary of financial information
 
 
June 30,
2018
 
December 31,
2017
 
(in thousands)
Carrying amount of investments in and loans to joint ventures
 
 
 
Ohio Castings
$
5,885

 
$
6,202

Axis
15,569

 
16,369

Total investments in and loans to joint ventures
$
21,454

 
$
22,571
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,
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Results of operations
 
 
 
 
 
 
 
Revenues
$
—

 
$
5

 
$
—

 
$
4,454

Gross (loss) profit
$
(425
)
 
$
(419
)
 
$
(912
)
 
$
(2,399
)
Net loss
$
(202
)
 
$
(33
)
 
$
(951
)
 
$
(2,467
)
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,
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Results of operations
 
 
 
 
 
 
 
Revenues
$
11,553

 
$
11,089

 
$
26,141

 
$
25,455

Gross profit
$
2,038

 
$
2,990

 
$
6,154

 
$
7,196

Net earnings
$
1,435

 
$
2,161

 
$
4,905

 
$
5,492