Unaudited Condensed Consolidated Statement of Partners' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Limited Partners [Member]	General Partner [Member]	Special L.P. Interests [Member]	AOCI Attributable to Parent [Member]	Accumulated Translation Adjustment [Member]	Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax						$ (16,566)
Beginning balance, units at Dec. 31, 2014		55,828
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Limited partnership unit options exercised		8
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited		(1)
Issuance of limited partnership units as compensation		117
Ending balance, units at Mar. 29, 2015		55,952
Beginning balance, value at Dec. 31, 2014		$ 101,556	$ 1	$ 5,936
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (83,833)	(83,832)	(1)
Partnership distribution declared ($0.825 and $0.75 per limited partnership unit)		(42,052)
Expense recognized for limited partnership unit options		223
Tax effect of units involved in treasury unit transactions	1,299	(1,299)
Issuance of limited partnership units as compensation		4,777
Period activity, net of tax $2,520 and ($4,147)	7,214					7,214
Period activity, net of tax $464 and $477	(2,439)						$ (2,439)
Ending balance, value at Mar. 29, 2015	(21,192)	$ (20,627)	0	5,290	$ (5,855)	13,150	(19,005)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax						(19,300)
Beginning balance, units at Dec. 31, 2015		56,018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Limited partnership unit options exercised		7
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited		0
Issuance of limited partnership units as compensation		44
Ending balance, units at Mar. 27, 2016		56,069
Beginning balance, value at Dec. 31, 2015	57,009	$ 48,428	0	22,591
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(48,486)	(48,486)	0
Partnership distribution declared ($0.825 and $0.75 per limited partnership unit)		(46,314)
Expense recognized for limited partnership unit options		5
Tax effect of units involved in treasury unit transactions	1,549	(1,549)
Issuance of limited partnership units as compensation		4,555
Period activity, net of tax $2,520 and ($4,147)	(4,395)					(4,395)
Period activity, net of tax $464 and $477	(2,631)						(2,631)
Ending balance, value at Mar. 27, 2016	$ (41,806)	$ (43,361)	$ 0	$ 5,290	$ (3,735)	$ 18,196	$ (21,931)