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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 |

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