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Net Income Per Unit (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended
Nov. 07, 2012
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Net income   $ 11,755     $ 2,487 $ 23,960 $ 4,997
Managing Member or General Partner, Subsequent Distribution Amount   193     0 382 0
Distribution Made to Limited Partner, Cash Distributions Paid   9,688 9,429 5,486      
Earnings in excess of (less than) distributions   2,067       4,843  
Weighted Average Limited Partnership Units Outstanding, Basic   12,006,843       12,003,071  
Weighted Average Limited Partnership Units Outstanding, Diluted   12,159,084       12,128,764  
Weighted average limited partner units outstanding- Subordinated units, Basic and Diluted   11,999,258       11,999,258  
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax   $ 0.48       $ 0.98  
Net Income (Loss), Per Outstanding Limited Partnership Unit, Diluted   $ 0.47       $ 0.97  
Net Income (Loss) per Subordinated unit (basic and diluted)   $ 0.48       $ 0.98  
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 2.00%         2.00%  
Weighted Average Number of Shares Outstanding, Basic     24,488,282     24,492,095  
General Partner [Member]
              
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Managing Member or General Partner, Subsequent Distribution Amount   193       382  
Earnings Per Unit Distributions Less Than Greater Than Earnings   41       96  
Earnings, General Partner Allocation   234       478  
Common Units [Member]
              
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Paid   4,755     0 9,375 0
Earnings Per Unit Distributions Less Than Greater Than Earnings   1,015       2,375  
Earnings, Limited Partners Allocation   5,770       11,750  
Subordinated Units [Member]
              
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Paid   4,740     0 9,360 0
Earnings Per Unit Distributions Less Than Greater Than Earnings   1,012       2,372  
Earnings, Limited Partners Allocation   5,752       11,732  
Subordinated Units [Member]
              
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Paid   4,740       9,360  
Common Units [Member]
              
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Paid   $ 4,755       $ 9,375