CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 302	$ 142
Accounts receivable, trade, net of allowance of $734 and $1,135, respectively	43,777	38,084
Due from affiliates, net	5,463
Total current assets	49,542	38,226
Property, plant and equipment	1,745,452	1,468,910
Accumulated depreciation	(602,103)	(491,615)
Net property, plant and equipment	1,143,349	977,295
Goodwill	124,019	124,019
Intangible and other assets, net	37,259	23,996
Total assets	1,354,169	1,163,536
Current liabilities:
Accrued liabilities	9,698	9,621
Accrued interest	711	1,473
Due to affiliates, net		21,598
Current portion of interest rate swaps	3,497	3,873
Total current liabilities	13,906	36,565
Long-term debt	732,548	680,500
Interest rate swaps	5,230	6,043
Deferred income taxes	946	885
Other long-term liabilities	585	543
Total liabilities	753,215	724,536
Commitments and contingencies (Note 12)
Partners' capital:
Common units, 49,455,393 and 42,313,731 units issued, respectively	593,913	436,587
General partner units, 2% interest with 1,003,227 and 858,583 equivalent units issued and outstanding, respectively	16,914	13,490
Accumulated other comprehensive loss	(8,810)	(10,094)
Treasury units, 47,007 and 43,630 common units, respectively	(1,063)	(983)
Total partners' capital	600,954	439,000
Total liabilities and partners' capital	$ 1,354,169	$ 1,163,536