UNAUDITED CONDENSED CONSOLIDATED STATEMENTS 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]
Beginning balance, units (in shares) at Dec. 31, 2017		56,359
Beginning balance, value at Dec. 31, 2017	$ 82,946	$ 81,589	$ 0	$ 5,290	$ (3,933)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(64,157)	(64,156)	(1)
Partnership distribution declared	(100,558)	$ (100,557)	(1)
Issuance of limited partnership units as compensation (in shares)		82
Issuance of limited partnership units as compensation	(657)	$ (657)
Tax effect of units involved in treasury unit transactions	(3,045)	(3,045)
Foreign currency translation adjustment	11,266				11,266
Cash flow hedging derivative activity, net of tax	4,134				4,134
Reclassification of stranded tax effect	0	$ 391			(391)
Ending balance, units (in shares) at Jun. 24, 2018		56,441
Ending balance, value at Jun. 24, 2018	(70,071)	$ (86,435)	(2)	5,290	11,076
Beginning balance, units (in shares) at Mar. 25, 2018		56,416
Beginning balance, value at Mar. 25, 2018	(50,963)	$ (58,550)	(1)	5,290	2,298
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	19,243	19,243	0
Partnership distribution declared	(50,292)	$ (50,291)	(1)
Issuance of limited partnership units as compensation (in shares)		25
Issuance of limited partnership units as compensation	3,169	$ 3,169
Tax effect of units involved in treasury unit transactions	(6)	$ (6)
Foreign currency translation adjustment	6,662				6,662
Cash flow hedging derivative activity, net of tax	2,116				2,116
Ending balance, units (in shares) at Jun. 24, 2018		56,441
Ending balance, value at Jun. 24, 2018	(70,071)	$ (86,435)	(2)	5,290	11,076
Beginning balance, units (in shares) at Dec. 31, 2018		56,564
Beginning balance, value at Dec. 31, 2018	32,416	$ 5,845	(1)	5,290	21,282
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(20,375)	(20,375)	0
Partnership distribution declared	(104,686)	$ (104,685)	(1)
Issuance of limited partnership units as compensation (in shares)		33
Issuance of limited partnership units as compensation	1,688	$ 1,688
Tax effect of units involved in treasury unit transactions	(1,561)	$ (1,561)
Foreign currency translation adjustment	(7,682)				(7,682)
Ending balance, units (in shares) at Jun. 30, 2019		56,597
Ending balance, value at Jun. 30, 2019	(100,200)	$ (119,088)	(2)	5,290	13,600
Beginning balance, units (in shares) at Mar. 31, 2019		56,587
Beginning balance, value at Mar. 31, 2019	(109,598)	$ (133,118)	(2)	5,290	18,232
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	63,298	63,297	1
Partnership distribution declared	(52,352)	$ (52,351)	(1)
Issuance of limited partnership units as compensation (in shares)		10
Issuance of limited partnership units as compensation	3,224	$ 3,224
Tax effect of units involved in treasury unit transactions	(140)	$ (140)
Foreign currency translation adjustment	(4,632)				(4,632)
Ending balance, units (in shares) at Jun. 30, 2019		56,597
Ending balance, value at Jun. 30, 2019	$ (100,200)	$ (119,088)	$ (2)	$ 5,290	$ 13,600