Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 13,941	$ 16,324	$ 46,058
Gross additions to tax positions taken during the current year	997	1,151	2,116
Gross additions to tax positions taken during the prior year	0	282	0
Gross reductions to tax positions taken during the prior year	(3,042)	(37)	(12,109)
Reductions from settlements with taxing authorities	0	0	(7,114)
Reductions from lapse of applicable statutes of limitations	(1,868)	(3,779)	(12,627)
Balance at end of year	$ 10,028	$ 13,941	$ 16,324