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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Predecessor [Member]
Cash flows from operating activities:    
Net income $ 8,994 $ 8,524
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and accretion 5,793 3,963
Amortization of deferred financing fees 6 0
Loss on disposal of assets and impairment charge 229 213
Non-cash stock based compensation 6 0
Deferred income tax 2,276 547
Changes in operating assets and liabilities:    
Accounts receivable (41,630) (15,618)
Accounts receivable from affiliates 2,962 (7,782)
Inventories (7,693) (2,910)
Other assets 428 1,502
Accounts payable 56,062 16,490
Accrued liabilities (1,004) (2,750)
Other noncurrent liabilities (517) (378)
Net cash provided by operating activities 25,912 1,801
Cash flows from investing activities:    
Capital expenditures (8,833) (4,839)
Purchase of intangibles (1,021) (1,571)
Purchase of short-term investments (259,654) 0
Redemption of short term investments 78,976 0
Proceeds from disposal of property and equipment 754 46
Net cash used in investing activities (189,778) (6,364)
Cash flows from financing activities:    
Change in notes receivable 32 186
Proceeds from issuance of long-term debt 180,666 0
Loan origination costs (1,891) 0
Proceeds from issuance of common units, net of offering costs 206,030 0
Distributions to Parent (206,030) 0
Predecessor cash retained by Parent (354) 0
Payments on long-term debt (17) (16)
Net cash provided by financing activities 178,436 170
Net increase (decrease) in cash 14,570 (4,393)
Cash and cash equivalents at beginning of year 240 4,749
Cash and cash equivalents at end of period 14,810  
Supplemental disclosure of non-cash activities:    
Contribution of net assets from Parent $ 68,070 $ 0