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Stock Based Compensation Stock Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,250,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,221,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 617 $ 9,273 $ 142
Allocated Share-based Compensation Expense 3,900 $ 3,700 $ 3,300
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 7,700    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 22 days    
Stock Units Awarded Under the 2009 LTIP Plan 21,000 18,000 15,000
Value of Stock Units Awarded Under the 2009 LTIP Plan $ 700 $ 500 $ 300
Total Numbner of Units Outstanding Under the 2006 Director Equity Plan 8,059    
Value of Units Outstanding Under the 2006 Director Equity Plan $ 200    
Deferred Compensation Liability, Current and Noncurrent 200 400 100
Stock or Unit Option Plan Expense $ (210) $ (217) $ (227)
Total Stock Units Outstanding Under All Stock Option Plans 48,781    
Total Value of Units Outstanding Under All Stock Option Plans $ 1,100    
Deferred Compensation Equity 1,300    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits $ 1,500