CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 142	$ 5
Accounts receivable, trade, net of allowance of $1,135 and $985, respectively	38,084	33,275
Due from affiliates, net		4,383
Total current assets	38,226	37,663
Property, plant and equipment	1,468,910	1,219,605
Accumulated depreciation	(491,615)	(412,553)
Net property, plant and equipment	977,295	807,052
Goodwill	124,019	124,019
Intangible and other assets, net	23,996	22,271
Total assets	1,163,536	991,005
Current liabilities:
Accrued liabilities	9,621	12,224
Accrued interest	1,473	1,278
Due to affiliates, net	21,598
Current portion of interest rate swaps	3,873	3,040
Total current liabilities	36,565	16,542
Long-term debt	680,500	545,500
Interest rate swaps	6,043	5,197
Other long-term liabilities	543
Deferred income taxes	885
Total liabilities	724,536	567,239
Commitments and contingencies (Note 13)
Partners' capital:
Common units, 42,313,731 and 37,308,402 units issued, respectively	436,587	420,960
General partner units, 2% interest with 858,583 and 757,722 equivalent units issued and outstanding, respectively	13,490	12,877
Accumulated other comprehensive loss	(10,094)	(9,313)
Treasury units, 43,630 and 33,811 common units, respectively	(983)	(758)
Total partners' capital	439,000	423,766
Total liabilities and partners' capital	$ 1,163,536	$ 991,005