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Debt and Financing Arrangements - Senior Revolving and Term Loan Facilities (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 24, 2014
Jul. 31, 2011
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 12, 2014
Jan. 20, 2012
Jul. 29, 2011
Line of Credit Facility [Line Items]                
Aggregate principal amount             $ 4.5 $ 168.0
Senior revolving credit facility                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity $ 95.0              
Outstanding Balance       $ 0.0        
Debt interest expense     $ 0.8 0.8 $ 0.9      
Senior revolving credit facility | Korea Development Bank                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity   $ 50.0            
Variable rate of interest   3.25%            
Senior revolving credit facility | Korea Development Bank | LIBOR                
Line of Credit Facility [Line Items]                
Commitment fee of unused portion (as a percent)   0.30%            
Senior revolving credit facility | Wells Fargo, National Association                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity           $ 75.0    
Senior Term Loan                
Line of Credit Facility [Line Items]                
Outstanding Balance       $ 30.0        
Interest rate (as a percent)       3.26%        
Debt interest expense     $ 0.7 $ 1.3 $ 0.1      
Senior Term Loan | Korea Development Bank                
Line of Credit Facility [Line Items]                
Aggregate principal amount $ 30.0              
Commitment fee of unused portion (as a percent) 0.30%              
Senior Term Loan | Korea Development Bank | LIBOR                
Line of Credit Facility [Line Items]                
Variable rate of interest 2.63%