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Earnings per Share Purchase of Common Stock (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Stock Repurchased and Retired During Period, Value | $ 36,740 | $ 12,140
10b5-1 share repurchase program [Member] |  |
Stock Repurchase Program, Authorized Amount | $ 150,000 | $ 50,000
Stock Repurchased and Retired During Period, Shares | 1,230,050 | 442,632
Stock Repurchased and Retired During Period, Value | $ 36,700 | $ 12,100

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