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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Examination        
Provisional income tax expense related to 2017 TCJA $ 13,200      
Excess tax benefits on stock-based compensation     $ 7,983 $ 9,028
Accrued interest and penalties related to taxes 200 $ 200 200 200
Unrecognized tax benefits, net of federal income tax benefits 3,700 $ 3,700 2,900 $ 2,700
Income tax examination, tax and interest settlement amount 100      
Decrease of reserve for unrecognized tax benefits 100      
Indiana        
Income Tax Examination        
Percentage of operating located in Indiana   80.00%    
Federal        
Income Tax Examination        
Taxes payable 2,300 $ 2,300    
Income taxes receivable     12,700  
State        
Income Tax Examination        
Taxes payable 1,700 1,700    
Income taxes receivable     $ 400  
Foreign        
Income Tax Examination        
Deferred tax liabilities $ 7,800 $ 7,800