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Income Taxes Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
state
Dec. 31, 2017
USD ($)
state
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Entity Location [Line Items]        
Deferred Tax Assets, Valuation Allowance $ 6,219,000 $ 6,219,000 $ 0  
Tax Cuts and Jobs Act of 2017, Provisional income tax expense (benefit) 27,300,000      
Tax Cuts And Jobs Act of 2017, deferred tax liability, provisional income tax (expense) benefit 29,200,000 29,200,000    
Tax on previously deferred earnings of foreign subsidiaries 1,900,000 1,900,000    
Undistributed Earnings of Foreign Subsidiaries 155,100,000 $ 155,100,000    
Income tax benefit, percent of likelihood of being realized upon settlement   5000.00%    
Unrecognized tax benefits 0 $ 0 0  
Income tax penalties and interest accrued $ 0 0 0  
Income tax penalties and interest expense   $ 0 $ 0 $ 0
Number of states subject to examination in years prior to 2010 | state 6 6    
United States        
Entity Location [Line Items]        
Federal statutory income tax rate   35.00%    
Mexico        
Entity Location [Line Items]        
Federal statutory income tax rate   30.00%    
Guatemala        
Entity Location [Line Items]        
Federal statutory income tax rate   25.00%    
EL Salvador        
Entity Location [Line Items]        
Federal statutory income tax rate   30.00%