CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 General Partner [Member]	Mar. 31, 2013 General Partner [Member]
Cash flows from operating activities:
Net loss	$ (1,289)	$ (6,382)	$ (26)	$ (128)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	8,528	7,249
Unit-based compensation	529	408
Amortization of deferred financing costs	337	267
Loss on asset disposal	4	0
Unrealized gain on financial instruments	(32)	0
Other, net	14	0
Changes in operating assets and liabilities:
Trade accounts receivable	(7,477)	8,648
Prepaid expenses and other current assets	813	1,199
Other non-current assets	(25)	(13)
Accounts payable and accrued liabilities	13,694	(11,725)
Other liabilities	(920)	(1,362)
Net cash provided by (used in) operating activities	14,176	(1,711)
Cash flows from investing activities:
Capital expenditures	(11,087)	(49,203)
Expenditures for assets subject to property damage claims, net of insurance proceeds and deductibles	(693)	(2,825)
Assets acquired	(38,636)	0
Net cash used in investing activities	(50,416)	(52,028)
Cash flows from financing activities:
Borrowings under our credit agreements	62,000	55,000
Repayments under our credit agreements	(158,450)
Payments on capital lease obligations	(143)	0
Financing costs	(156)	(519)
Contributions from general partner			3,115	0
Payments of distributions and distribution equivalent rights	(13,755)	(5,982)
LTIP tax withholdings on vested units	(1)	0
Net cash provided by financing activities	37,325	48,499
Net (decrease) increase in cash and cash equivalents	1,085	(5,240)
Cash and cash equivalents — Beginning of period	3,349	7,490
Cash and cash equivalents — End of period	$ 4,434	$ 2,250