Stock-Based Awards - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Options (number of shares):
Exercised (shares)	(657,704)	(114,652)	(341,362)
Weighted Average Exercise Price (in dollars per share):
Total intrinsic value	$ 7,000	$ 700	$ 2,700
Employee Stock Option [Member]
Options (number of shares):
Options outstanding at beginning of year (shares)	4,518,000
Exercised (shares)	(658,000)
Forfeited/Expired (shares)	(86,000)
Options outstanding at end of period (shares)	3,774,000	4,518,000
Options exercisable at end of period (shares)	3,774,000
Weighted Average Exercise Price (in dollars per share):
Options outstanding at beginning of year (in dollars per share)	$ 14
Exercised (in dollars per share)	7
Forfeited/Expired (in dollars per share)	24
Options outstanding at end of period (in dollars per share)	15	$ 14
Options exercisable at end of period	$ 15
Outstanding weighted average remaining contractual term, beginning of period	2 years	3 years
Outstanding weighted average remaining contractual term, end of period	2 years	3 years
Options exercisable weighted average remaining contractual term	2 years
Outstanding aggregate intrinsic value, beginning of period	$ 12,797
Outstanding aggregate intrinsic value, end of period	17,597	$ 12,797
Options exercisable aggregate intrinsic value	$ 17,597