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Restructuring (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of activity for liabilities [Roll Forward]      
Impairment of idled equipment $ 5,569 $ 1,147 $ 0
Selling, General and Administrative Expenses [Member]      
Summary of activity for liabilities [Roll Forward]      
Impairment of idled equipment 3,700    
EBOL Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Incurred in 2016 9,686    
Inception to Date Costs Incurred 9,686    
Total Expected to be Incurred 9,727    
Termination Benefits [Member]      
Summary of activity for liabilities [Roll Forward]      
Balance, beginning of period 0    
Expenses incurred 5,246    
Amount paid (889)    
Other adjustments 0    
Balance, end of period 4,357 $ 0  
Termination Benefits [Member] | EBOL Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Incurred in 2016 5,246    
Inception to Date Costs Incurred 5,246    
Total Expected to be Incurred 5,287    
Abandonment of Equipment [Member] | EBOL Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Incurred in 2016 3,749    
Inception to Date Costs Incurred 3,749    
Total Expected to be Incurred 3,749    
Other Costs [Member] | EBOL Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Incurred in 2016 691    
Inception to Date Costs Incurred 691    
Total Expected to be Incurred 691    
Retention Payments [Member]      
Summary of activity for liabilities [Roll Forward]      
Amount paid $ 2,000