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Earnings per Share Purchase of Common Stock (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock Repurchased and Retired During Period, Value | $ 39,420,000 | $ 36,740,000 | $ 12,140,000
10b5-1 share repurchase program [Member] |  |  |
Stock Repurchase Program, Authorized Amount | $ 250,000,000 |  | $ 50,000,000
Stock Repurchased and Retired During Period, Shares | 1,582,049 | 1,230,050 | 442,632
Stock Repurchased and Retired During Period, Value | $ 39,400,000 | $ 36,700,000 | $ 12,100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 161,700,000 |  |

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