Goodwill And Other Intangibles (Components Of Goodwill By Reporting Units) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill	$ 6,337,719	$ 6,337,719
Central [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill	1,815,498
East [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill	2,003,574
National [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill	1,218,113
West [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill	$ 1,300,534