Consolidated Statements Of Partners' Capital (USD $) In Thousands, except Share data, unless otherwise specified	Total	Number Of Common Units [Member]	Common Unitholders [Member]	General Partners [Member]	Accumulated Other Comprehensive Loss [Member]	Non-Controlling Interests [Member]
Partners' capital, value at Dec. 31, 2009	$ 618,933		$ 585,554	$ 11,152	$ (829)	$ 23,056
Partners' capital, shares at Dec. 31, 2009		39,488,000
Comprehensive income:
Net income (loss)	(50,541)		17,933	(66,392)	0	(2,082)
Interest rate swap losses reclassified to interest expense	2,112			0	1,035	1,077
Interest rate swap loss	(424)			0	(206)	(218)
Cash contributions	2,541			2,528		13
Contribution for management compensation (Note 11)	76,923			76,923		0
Cash distributions	(70,359)		(58,983)	(11,369)		(7)
Acquisition of noncontrolling interest in DG Marine (Note 3)	(26,288)		(4,920)	(100)		(21,268)
Issuance of units for cash, shares		5,175,000
Issuance of units for cash, value	116,347		116,347	0		0
Issuance of units in exchange for general partner interest, shares (Note 11)		19,854,000
Issuance of units in exchange for general partner interest, value (Note 11)	0		13,313	(12,742)		(571)
Issuance of units under LTIP, shares		98,000
Issuance of units under LTIP, value	20		20	0		0
Partners' capital, value at Dec. 31, 2010	669,264		669,264	0	0	0
Partners' capital, shares at Dec. 31, 2010		64,615,000
Comprehensive income:
Net income (loss)	51,249	0	51,249
Interest rate swap losses reclassified to interest expense	0
Interest rate swap loss	0
Cash distributions	(112,844)	0	(112,844)
Issuance of units for cash, shares		7,350,000
Issuance of units for cash, value	184,969		184,969
Partners' capital, value at Dec. 31, 2011	792,638		792,638
Partners' capital, shares at Dec. 31, 2011	71,965,062	71,965,000
Comprehensive income:
Net income (loss)	96,319	0	96,319
Interest rate swap losses reclassified to interest expense	0
Interest rate swap loss	0
Cash distributions	(142,383)	0	(142,383)
Issuance of units for cash, shares		5,750,000
Issuance of units for cash, value	169,421		169,421
Partners' Capital Account, Units, Converted		3,476,000
Partners' Capital Account, Exchanges and Conversions	0		0
Partners' capital, units, other		12,000
Partners' capital, Other	500		500
Partners' capital, value at Dec. 31, 2012	$ 916,495		$ 916,495
Partners' capital, shares at Dec. 31, 2012	81,202,752	81,203,000