Equity (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount	$ 400,000
Treasury Stock, Shares, Acquired	0.3
Treasury Stock, Value, Acquired, Cost Method	$ 49,052	$ 2,616
Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 50,000