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		11
Issuance of limited partnership units as compensation		132
Net loss	(39,638)	(39,638)	0
Partnership distribution declared ($1.40 per limited partnership unit)		(78,275)
Expense recognized for limited partnership unit options		446
Tax effect of units involved in option exercises and treasury unit transactions		(725)
Issuance of limited partnership units as compensation		6,263
Weighted average limited partner units outstanding	55,453
Current period activity, net of tax $501 at Jun. 29, 2014	(2,891)						(2,891)
Ending balance, value at Jun. 29, 2014	23,615	36,918	2	5,290	(18,595)	(691)	(17,904)
Current period activity, net of tax $402 at Jun. 29, 2014	$ (696)					$ (696)
Ending balance, units at Jun. 29, 2014		55,859