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Business Combinations Hudson Net Assets Acquired (Details) - USD ($)
Sep. 30, 2017
Sep. 20, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 457,481,000 $ 227,397,000 $ 217,970,000
Identifiable intangible assets   202,000,000  
Accounts receivable   34,669,000  
Property, plant and equipment   30,590,000  
Inventories   24,900,000  
Other current assets [1]   9,359,000  
Unbilled contract revenue   4,589,000  
Other assets   2,876,000  
Prepaid expenses   873,000  
Deferred tax liabilities   (68,559,000)  
Accounts payable   (21,246,000)  
Customer advances and billings in excess of contract revenue   (16,928,000)  
Accrued salaries, wages and benefits   (4,442,000)  
Other current liabilities   (3,984,000)  
Other long-term liabilities   (1,861,000)  
Current portion of warranty reserve   (839,000)  
Restricted Cash and Cash Equivalents $ 8,785,000 2,343,000  
Net assets acquired   419,394,000  
Hudson [Member]      
Business Acquisition [Line Items]      
Identifiable intangible assets   $ 202,000,000  
[1] Pursuant to the provisions of the Merger Agreement, Hudson deposited $2,343 into a Rabbi Trust which represents amounts payable to eligible parties under Long-Term Incentive Agreements. This balance is treated as restricted cash and restricted cash equivalents in the condensed consolidated balance sheets and is classified as other current assets.