Noncontrolling Interests (Effect Of Changes In Ownership Interest In Subsidiaries On Consolidated Equity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income adjusted for noncontrolling interests	$ 327,601	$ 335,274	$ 238,933
Transfers from the noncontrolling interests:
Net increase in equity for the acquisition of noncontrolling interests	0	0	2,139
Change from net income adjusted for noncontrolling interests and transfers from the noncontrolling interests	$ 327,601	$ 335,274	$ 241,072