Goodwill (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill

	(In Thousands)
	Mid-America		Southeast		West
	Group		Group		Group		Total
Balance at January 1, 2017	$	281,403	$	50,346	$	1,827,588	$	2,159,337
Adjustments to purchase price allocations		—		—		723		723
Balance at June 30, 2017	$	281,403	$	50,346	$	1,828,311	$	2,160,060