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Equity (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  | 1.8
Treasury Stock, Value, Acquired, Cost Method | $ (30,487) | $ (108,804) | $ (98,231) | $ (273,873)
Stock Repurchase Program, Authorized Amount | $ 400,000 |  | $ 400,000 |
RGA Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 0.5 |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 79,800 | $ 258,500

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