Goodwill and Intangible Assets (Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 30, 2016	Sep. 25, 2015	Dec. 25, 2015
Finite-lived intangible assets
Cost	$ 182,536		$ 182,536		$ 192,079
Accumulated Amortization	(138,625)		(138,625)		(133,068)
Amortization expense	4,400	$ 6,200	13,924	$ 19,700
Future estimated amortization expense of intangible assets
2016 (three months remaining)	4,374		4,374
2017	16,333		16,333
2018	4,313		4,313
2019	3,580		3,580
2020	3,580		3,580
2021	3,580		3,580
Thereafter	8,151		8,151
Net finite-lived intangible assets	43,911		$ 43,911		59,011
Minimum
Finite-lived intangible assets
Useful lives of intangible assets			2 years
Maximum
Finite-lived intangible assets
Useful lives of intangible assets			10 years
Customer relationships
Finite-lived intangible assets
Cost	178,492		$ 178,492		187,580
Accumulated Amortization	(134,581)		(134,581)		(128,655)
Future estimated amortization expense of intangible assets
Net finite-lived intangible assets	43,911		43,911		58,925
Tradename
Finite-lived intangible assets
Cost	4,044		4,044		4,499
Accumulated Amortization	$ (4,044)		$ (4,044)		(4,413)
Future estimated amortization expense of intangible assets
Net finite-lived intangible assets					$ 86