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Net Income Per Unit (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Nov. 07, 2012
Dec. 31, 2012
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Nov. 05, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net Income Per Unit [Abstract]                            
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 2.00%                     2.00%    
Revenue, Net   $ 111,208 $ 249,216 $ 271,806 $ 262,480 $ 239,084 $ 187,000 $ 199,825 $ 198,158 $ 159,096 $ 911,378 $ 1,022,586 $ 744,079 $ 504,408
Cost of Goods Sold   96,933                 862,501 959,434 700,505 476,678
Operating Costs and Expenses   2,931                 20,431 23,362 12,940 2,920
General and Administrative Expense   1,169                 7,220 8,389 5,795 4,247
Depreciation, Depletion and Amortization   1,205                 7,470 8,675 4,820 2,810
Gain (Loss) on Disposition of Assets   0                 9 9 (2) 0
Costs and Expenses   102,238                 897,631 999,869 724,058 486,655
Operating Income (Loss)   8,970 7,791 6,072 3,935 4,919 4,707 5,754 3,112 6,448 13,747 22,717 20,021 17,753
Interest Expense   496                 2,186 2,682 2,011 2,564
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest   8,474                 11,561 20,035 18,010 15,189
Income Tax Expense (Benefit)   64                 (14,088) (14,024) 5,363 5,102
Predecessor net income through November 6, 2012                       25,649    
Net income subsequent to initial public offering   8,410                   8,410    
Net income     26,092 2,968 2,488 2,511 3,488 3,400 2,001 3,758   34,059 12,647 10,087
Comprehensive Income (Loss), Attributable to Predecessor                       25,649    
Comprehensive operations                       34,059 12,647 10,087
Comprehensive income (loss), subsequent to IPO                       8,410    
Net Income (Loss) Allocated to General Partners                       168    
Net Income (Loss) Allocated to Limited Partners                       $ 8,242    
Weighted Average Limited Partnership Units Outstanding, Basic                       11,999,258    
Weighted average limited partner units outstanding- Subordinated units, Basic and Diluted                       11,999,258    
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic                       0.34    
Net Income (Loss) per Subordinated unit (basic and diluted)                       0.34