Unaudited Condensed Consolidated Statement of Partners' Equity (USD $) In Thousands, unless otherwise specified	Total	Limited Partners [Member]	General Partner [Member]	Special L.P. Interests [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Translation Adjustment [Member]	Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning balance, value at Dec. 31, 2013	$ 139,131	$ 148,847	$ 2	$ 5,290		$ 5	$ (15,013)
Beginning balance, units at Dec. 31, 2013		55,716
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Limited partnership unit options exercised		7
Issuance of limited partnership units as compensation		112
Net loss	(83,540)	(83,539)	(1)
Partnership distribution declared ($0.70 per limited partnership unit)		(39,091)
Expense recognized for limited partnership unit options		223
Tax effect of units involved in option exercises and treasury unit transactions		(568)
Issuance of limited partnership units as compensation		3,665
Weighted average limited partner units outstanding	55,500
Current period activity, net of tax $106 at Mar. 30, 2014	(650)						(650)
Ending balance, value at Mar. 30, 2014	20,791	29,537	1	5,290	(14,037)	1,626	(15,663)
Current period activity, net of tax ($932) at Mar. 30, 2014	$ 1,621					$ 1,621
Ending balance, units at Mar. 30, 2014		55,835