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, 2012	$ 154,451	$ 177,660	$ 1	$ 5,290		$ (2,751)	$ (25,749)
Beginning balance, units at Dec. 31, 2012		55,618
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Limited partnership unit options exercised		2
Issuance of limited partnership units as compensation		93
Net loss	(61,736)	(61,735)	(1)
Partnership distribution declared ($1.25 per limited partnership unit)		(69,639)
Expense recognized for limited partnership unit options		457
Limited partnership unit options exercised		28
Tax effect of units involved in option exercises and treasury unit transactions		(130)
Issuance of limited partnership units as compensation		3,345
Weighted average limited partner units outstanding	55,464
Current period activity, net of tax ($1,861) at Jun. 30, 2013	10,564						10,564
Ending balance, value at Jun. 30, 2013	39,233	49,986	0	5,290	(16,043)	(858)	(15,185)
Current period activity, net of tax ($1,090) at Jun. 30, 2013	$ 1,893					$ 1,893
Ending balance, units at Jun. 30, 2013		55,713