CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Revenue - third parties	$ 164,248us-gaap_SalesRevenueServicesNet	$ 120,961us-gaap_SalesRevenueServicesNet
Revenue - affiliates	47us-gaap_RevenueFromRelatedParties	85us-gaap_RevenueFromRelatedParties
Total revenue	164,295us-gaap_SalesRevenueNet	121,046us-gaap_SalesRevenueNet
Costs and expenses:
Cost of sales (excluding depreciation and amortization expense) - affiliates	65,168	53,203
Depreciation and amortization	36,105	27,921
Long-lived asset impairment	3,484	2,486
Restructuring charges		379
Selling, general and administrative - affiliates	21,169	19,376
Interest expense	17,832us-gaap_InterestExpense	9,689us-gaap_InterestExpense
Other (income) expense, net	(191)us-gaap_OtherNonoperatingIncomeExpense	871us-gaap_OtherNonoperatingIncomeExpense
Total costs and expenses	143,567us-gaap_CostsAndExpenses	113,925us-gaap_CostsAndExpenses
Income before income taxes	20,728	7,121
Provision for income taxes	643us-gaap_IncomeTaxExpenseBenefit	182us-gaap_IncomeTaxExpenseBenefit
Net income	20,085us-gaap_IncomeLossAttributableToParent	6,939us-gaap_IncomeLossAttributableToParent
General partner interest in net income	4,209	2,604
Common units interest in net income	$ 15,876	$ 4,335
Weighted average common units outstanding used in income per common unit:
Basic (in units)	55,678	49,429
Diluted (in units)	55,678	49,435
Income per common unit:
Basic (in dollars per unit)	$ 0.28	$ 0.09
Diluted (in dollars per unit)	$ 0.28	$ 0.09
Distributions declared and paid per limited partner unit in respective periods (in dollars per unit)	$ 0.5575	$ 0.5325

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