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Investments in and Loans to Joint Ventures (Tables)
 9 Months Ended
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]  
Summary of financial information
 
 
September 30,
2018
 
December 31,
2017
 
(in thousands)
Carrying amount of investments in and loans to joint ventures
 
 
 
Ohio Castings
$
5,680

 
$
6,202

Axis
14,646

 
16,369

Total investments in and loans to joint ventures
$
20,326

 
$
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
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Results of operations
 
 
 
 
 
 
 
Revenues
$
—

 
$
15

 
$
—

 
$
4,469

Gross loss
$
(387
)
 
$
(396
)
 
$
(1,299
)
 
$
(2,795
)
Net loss
$
(618
)
 
$
(712
)
 
$
(1,569
)
 
$
(3,179
)
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
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
 
(in thousands)
Results of operations
 
 
 
 
 
 
 
Revenues
$
13,391

 
$
10,432

 
$
39,532

 
$
35,887

Gross profit
$
1,928

 
$
1,448

 
$
8,082

 
$
8,644

Net earnings
$
1,369

 
$
688

 
$
6,274

 
$
6,180