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Goodwill and Other Intangible Assets - Goodwill Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Goodwill [Line Items]        
Goodwill, Impairment Loss       $ 60,200
Aerospace Reporting Unit [Member]        
Goodwill [Line Items]        
Goodwill, Impairment Loss   $ 60,200    
Energy Reporting Unit [Member]        
Goodwill [Line Items]        
Goodwill, Impairment Loss     $ 70,900  
Engine Products Reporting Unit [Member]        
Goodwill [Line Items]        
Goodwill, Impairment Loss     $ 3,200  
Goodwill [Member]        
Goodwill [Line Items]        
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Income-Based Approach     75.00%  
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach     25.00%  
Fair Value Inputs, Long-term Revenue Growth Rate     3.00%  
Goodwill [Member] | Maximum [Member]        
Goodwill [Line Items]        
Fair Value Inputs, Discount Rate     14.50%  
Goodwill [Member] | Minimum [Member]        
Goodwill [Line Items]        
Fair Value Inputs, Discount Rate     11.00%  
Goodwill [Member] | Aerospace Reporting Unit [Member]        
Goodwill [Line Items]        
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Income-Based Approach 50.00% 50.00%   50.00%
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach 50.00% 50.00%   50.00%
Fair Value Inputs, Discount Rate 9.50% 10.30%    
Fair Value Inputs, Long-term Revenue Growth Rate 3.00% 3.00%    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 15.00%