CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues:
Terminalling and storage	$ 77,283	$ 67,117	$ 69,710
Marine transportation	76,936	77,642	68,480
Sulfur services	11,400	0	0
Product sales:
Natural gas services	733,087	554,482	408,982
Sulfur services	263,644	165,078	79,629
Terminalling and storage	74,723	47,799	35,584
Total product sales	1,071,454	767,359	524,195
Total revenues	1,237,073	912,118	662,385
Cost of products sold: (excluding depreciation and amortization)
Natural gas services	704,073	527,232	382,542
Sulfur services	219,697	122,121	43,386
Terminalling and storage	67,134	44,549	31,331
Total cost of products sold (excluding depreciation and amortization)	990,904	693,902	457,259
Expenses:
Operating expenses	140,197	116,402	117,438
Selling, general and administrative	22,665	21,118	19,775
Depreciation and amortization	44,957	40,656	39,506
Total costs and expenses	1,198,723	872,078	633,978
Other operating income	1,326	136	6,013
Operating income	39,676	40,176	34,420
Other income (expense):
Equity in earnings of unconsolidated entities	9,536	9,792	7,044
Interest expense	(24,518)	(33,716)	(18,995)
Other, net	233	287	326
Total other income (expense)	(14,749)	(23,637)	(11,625)
Net income before taxes	24,927	16,539	22,795
Income tax benefit (expense)	(585)	(517)	(592)
Net income	24,342	16,022	22,203
General partner's interest in net income	5,289	3,869	3,249	[1]
Limited partners' interest in net income	$ 17,945	$ 11,045	$ 17,179	[1]
Net income per limited partner unit - basic and diluted (in dollars per unit)	$ 0.92	$ 0.63	$ 1.17
Weighted average limited partner units - basic (in units)	19,545,427	17,525,089	14,680,807
Weighted average limited partner units - diluted (in units)	19,546,705	17,525,989	14,684,775

[1] General and limited partner's interest in net income includes net income of the Cross assets since the date of the acquisition.