Goodwill And Intangible Assets (Changes In Carrying Amount Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Balance, beginning of year	$ 3,381,149	$ 1,758,970
Goodwill acquired, including post acquisition adjustments	674,476	1,636,521
Goodwill disposed, including impact of deconsolidation transactions	(85,415)	(14,342)
Balance, end of year	$ 3,970,210	$ 3,381,149