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Investments in and Loans to Joint Ventures (Tables)
 9 Months Ended
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]  
Summary of financial information
 
 
September 30,
2015
 
December 31,
2014
 
(in thousands)
Carrying amount of investments in and loans to joint ventures
 
 
 
Ohio Castings
$
8,141

 
$
9,194

Axis
20,555

 
19,974

Total investments in and loans to joint ventures
$
28,696

 
$
29,168
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,
 
2015
 
2014
 
2015
 
2014
 
(in thousands)
Results of operations
 
 
 
 
 
 
 
Revenues
$
16,728

 
$
24,717

 
$
60,623

 
$
60,981

Gross profit
$
699

 
$
2,961

 
$
5,061

 
$
5,896

Net (loss) earnings
$
(205
)
 
$
3,085

 
$
2,324

 
$
4,288
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,
 
2015
 
2014
 
2015
 
2014
 
(in thousands)
Results of operations
 
 
 
 
 
 
 
Revenues
$
17,812

 
$
16,614

 
$
57,229

 
$
49,690

Gross profit
$
4,571

 
$
(610
)
 
$
14,848

 
$
904

Earnings (loss) before interest
$
4,333

 
$
(843
)
 
$
14,097

 
$
180

Net earnings (loss)
$
3,341

 
$
(2,051
)
 
$
10,891

 
$
(3,523
)