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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

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