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Stock Based Compensation Stock Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 1,714,293    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 14,500 $ 600 $ 9,300
Share-based Payment Arrangement, Expense 3,600 $ 3,900 $ 3,700
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 7,800    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 1 month 6 days    
Stock Units Awarded Under the 2009 LTIP Plan 24,000 21,000 18,000
Value of Stock Units Awarded Under the 2009 LTIP Plan $ 700 $ 700 $ 500
Total Numbner of Units Outstanding Under the 2006 Director Equity Plan 8,059    
Value of Units Outstanding Under the 2006 Director Equity Plan $ 200    
Stock or Unit Option Plan Expense $ (200) (210) (217)
Total Stock Units Outstanding Under All Stock Option Plans 63,958    
Total Value of Units Outstanding Under All Stock Option Plans $ 1,500    
Deferred Compensation Equity 2,500    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits 1,100    
Deferred Compensation Liability, Current and Noncurrent $ 200 $ 200 $ 400