CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 11,650	$ 142
Accounts receivable, trade, net of allowance of $828 and $1,135, respectively	51,959	38,084
Total current assets	63,609	38,226
Property, plant and equipment	1,737,580	1,468,910
Accumulated depreciation	(613,701)	(491,615)
Property, plant and equipment, net	1,123,879	977,295
Goodwill	124,019	124,019
Intangible and other assets, net	36,023	23,996
Total assets	1,347,530	1,163,536
Current liabilities:
Accrued liabilities	7,717	9,621
Accrued interest	6,268	1,473
Due to affiliates, net	226	21,598
Current portion of interest rate swaps	3,276	3,873
Total current liabilities	17,487	36,565
Long-term debt	714,682	680,500
Interest rate swaps		6,043
Deferred income taxes	1,007	885
Other long-term liabilities	602	543
Total liabilities	733,778	724,536
Commitments and contingencies (Note 12)
Partners' capital:
Common units, 49,456,901 and 42,313,731 units issued, respectively	600,722	436,587
General partner units, 2% interest with 1,003,227 and 858,583 equivalent units issued and outstanding, respectively	16,813	13,490
Accumulated other comprehensive loss	(2,709)	(10,094)
Treasury units, 47,420 and 43,630 common units, respectively	(1,074)	(983)
Total partners' capital	613,752	439,000
Total liabilities and partners' capital	$ 1,347,530	$ 1,163,536