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Accounts Receivable and Contracts in Progress (Tables)
 12 Months Ended
Dec. 31, 2014
Accounts Receivable [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts receivable at December 31, 2014 and 2013, consists of the following:
 
December 31,
 
2014
 
2013
Accounts receivable
$
64,004

 
$
40,842

Unbilled receivables
7,959

 
6,784

Total receivables
71,963

 
47,626

Less: Allowance for doubtful accounts
(868
)
 
(1,060
)
Accounts receivable, net
$
71,095

 
$
46,566
Schedule Of Contracts In Progress [Table Text Block]
Activity related to contracts in progress at December 31, 2014 and 2013, is summarized as follows:
 
December 31,
 
2014
 
2013
Costs and estimated earnings recognized to date
$
349,874

 
$
221,905

Progress billings to date
(400,349
)
 
(260,372
)
Total
$
(50,475
)
 
$
(38,467
)
Schedule Of Unbilled Receivables And Deferred Revenue [Table Text Block]
These amounts are included in the accompanying Consolidated Balance Sheets at December 31, 2014 and 2013, as follows: 
 
December 31,
 
2014
 
2013
Unbilled receivables
$
7,959

 
$
6,784

Deferred revenue
(58,434
)
 
(45,251
)
Total
$
(50,475
)
 
$
(38,467
)