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Goodwill and Other Intangible Assets - Goodwill Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]        
Goodwill, Impairment Loss     $ 60,200 $ 74,110
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%   75.00%
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach   25.00%   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%  
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach 50.00%   50.00%  
Fair Value Inputs, Discount Rate 10.30%      
Fair Value Inputs, Long-term Revenue Growth Rate 3.00%