Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 24, 2013	Sep. 30, 2014	Sep. 24, 2013
Amounts used for basic and diluted per share calculations
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 39,214	$ 42,762	$ 130,801	$ 141,921
Weighted average number of shares outstanding - basic (in shares)	26,715	28,744	26,979	28,995
Effect of dilutive stock-based employee compensation awards (in shares)	98	155	129	178
Weighted average number of shares outstanding - diluted (in shares)	26,813	28,899	27,108	29,173
Earnings per common share:
Basic (in dollars per share)	$ 1.47	$ 1.49	$ 4.85	$ 4.89
Diluted (in dollars per share)	$ 1.46	$ 1.48	$ 4.83	$ 4.86