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Net Income per Unit Schedule of Earnings Per Share, Basic and Diluted (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | A reconciliation of the numerators and denominators of the basic and diluted per unit computations is as follows:
| Three Months Ended |  | Nine Months Ended
| September 30, 2013 |  | September 30, 2013
| (in thousands, except units and per unit amounts)
Net income | $ | 9,597 |  |  | $ | 27,504 |
Less: General partner's interest in net income | — |  |  | — |
Limited partners' interest in net income | $ | 9,597 |  |  | $ | 27,504 |
Weighted average limited partner units outstanding: |  |  |
Common - basic | 10,963,671 |  |  | 10,947,514 |
Common - equivalents | 26,970 |  |  | 21,845 |
Common - diluted | 10,990,641 |  |  | 10,969,359 |
Subordinated - SUSS (basic and diluted) | 10,939,436 |  |  | 10,939,436 |
Net income per limited partner unit: |  |  |
Common - basic | $ | 0.44 |  |  | $ | 1.26 |
Common - diluted | $ | 0.43 |  |  | $ | 1.25 |
Subordinated - SUSS (basic and diluted) | $ | 0.44 |  |  | $ | 1.26 |
| Three Months Ended |  | Nine Months Ended
| September 30, 2012 |  | September 30, 2012
| (in thousands, except units and per unit amounts)
Net income | $ | 3,617 |  |  | $ | 8,994 |
Less: Predecessor income prior to initial public offering on September 25, 2012 | 3,043 |  |  | 8,420 |
Limited partners' interest in net income | $ | 574 |  |  | $ | 574 |
Net income per limited partner unit: |  |  |
Common | $ | 0.03 |  |  | $ | 0.03 |
Subordinated | $ | 0.03 |  |  | $ | 0.03 |
Limited partner units outstanding: |  |  |
Common units - public | 10,925 |  |  | 10,925,000 |
Common units - affiliated | 14.436 |  |  | 14,436 |
Subordinated units - affiliated | 10,939.436 |  |  | 10,939,436 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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