Supplemental Stockholders' Equity Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 25, 2012	Mar. 27, 2011
Changes in stockholders' equity
Total stockholders' equity, period start	$ 509,509	$ 664,076
Net income	42,077	5,226
Other comprehensive income, net of tax	398	7,483
Effect of issuance of shares	(26)	5,765
Stock-based compensation	3,973	7,087
Total stockholders' equity, period end	555,931	689,637
Parent [Member]
Changes in stockholders' equity
Total stockholders' equity, period start	506,360	659,927
Net income	42,130	5,419
Other comprehensive income, net of tax	398	7,483
Effect of issuance of shares	(26)	5,765
Stock-based compensation	3,973	7,087
Total stockholders' equity, period end	552,835	685,681
Noncontrolling Interest [Member]
Changes in stockholders' equity
Total stockholders' equity, period start	3,149	4,149
Net income	(53)	(193)
Other comprehensive income, net of tax	0	0
Effect of issuance of shares	0	0
Stock-based compensation	0	0
Total stockholders' equity, period end	$ 3,096	$ 3,956