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]	AOCI Attributable to Parent [Member]	Accumulated Translation Adjustment [Member]	Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Beginning balance, value at Dec. 31, 2014	$ 96,217	$ 101,556	$ 1			$ 5,936	$ (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
Net loss	(83,833)	(83,832)	(1)
Partnership distribution declared ($0.75 per limited partnership unit)		(42,052)
Expense recognized for limited partnership unit options		223
Tax effect of units involved in option exercises and treasury unit transactions		(1,299)
Issuance of limited partnership units as compensation		4,777
Weighted average limited partner units outstanding	55,820
Current period activity, net of tax $477 at Mar. 29, 2015	(2,439)						(2,439)
Ending balance, value at Mar. 29, 2015	(21,192)	(20,627)	0	5,290	(5,855)	13,150	(19,005)
Current period activity, net of tax ($4,147) at Mar. 29, 2015	$ 7,214					$ 7,214
Ending balance, units at Mar. 29, 2015		55,952