Equity Equity (Share Repurchase Program) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired			1,356,892
Treasury Stock, Value, Acquired, Cost Method	$ 299,679	$ 43,508	$ 122,916
Treasury Stock Value Acquired Cost Method Repurchase Agreement			$ 116,500
Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired	1,932,055,000	208,680,000
Treasury Stock, Value, Acquired, Cost Method	$ 283,524	$ 26,897
Treasury Stock Acquired, Average Cost Per Share	$ 146,750	$ 128,890
Treasury Stock Shares Acquired Share Repurchase Authorization	2,140,735,000
Treasury Stock Value Acquired Cost Method Repurchase Agreement	$ 310,421