Equity (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Stock Repurchase Program, Authorized Amount		$ 400,000	$ 400,000
Treasury Stock, Shares, Acquired			1,356,892
Treasury Stock Value Acquired Cost Method Repurchase Agreement			$ 116,500
Treasury Stock, Value, Acquired, Cost Method	$ 299,679	$ 43,508	$ 122,916