Equity (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired				1.0
Treasury Stock, Value, Acquired, Cost Method	$ (18,692)	$ (162,453)	$ (67,744)	$ (165,069)
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			0.3
Treasury Stock, Value, Acquired, Cost Method			$ 50,000	$ 150,000