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Cash Distributions and Net Income (Loss) per Common Unit (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
Common Units
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Jun. 30, 2012
Common Units
|
Jun. 30, 2013
Common Units
|
Jun. 30, 2012
Common Units
|
Jun. 30, 2013
Class B Unit [Member]
|
Jun. 30, 2012
Class B Unit [Member]
|
Jun. 30, 2013
Class B Unit [Member]
|
Jun. 30, 2012
Class B Unit [Member]
|
Jun. 30, 2013
Subordinated Units
|
Jun. 30, 2012
Subordinated Units
|
Jun. 30, 2013
Subordinated Units
|
Jun. 30, 2012
Subordinated Units
|
Jun. 30, 2013
General Partner [Member]
|
Jun. 30, 2012
General Partner [Member]
|
Jun. 30, 2013
General Partner [Member]
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Jun. 30, 2012
General Partner [Member]
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May 28, 2013
Class B Unit [Member]
|
Sep. 30, 2012
Class B Unit [Member]
|
May 31, 2012
Class B Unit [Member]
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| Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] | |||||||||||||||||||||||
| Partners' Capital Account, Units, Sold in Private Placement | 12,000,000 | 133,300,000 | |||||||||||||||||||||
| Partners Capital Account, Units, Sold In Public Offering, Unit Price | $ 15.0 | $ 15.00 | |||||||||||||||||||||
| Declared distributions | $ 24,754 | $ 13,612 | $ 49,508 | $ 27,207 | $ 24,259 | $ 13,340 | $ 48,518 | $ 26,663 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 495 | $ 272 | $ 990 | $ 544 | |||
| Assumed allocation of undistributed net loss | (62,616) | (38,473) | (129,857) | (71,400) | (18,199) | (7,096) | (13,169) | 0 | 0 | 0 | (43,165) | (30,608) | (56,803) | (1,252) | (769) | (1,428) | |||||||
| Assumed allocation of net income (loss) | 6,060 | 5,352 | 10,777 | 12,602 | 0 | 4,737 | 0 | 4,737 | (43,165) | (34,453) | (89,519) | (60,648) | (757) | (497) | (1,607) | (884) | |||||||
| Weighted average units outstanding (shares) | 57,079,000 | 31,328,000 | 51,345,000 | 31,173,000 | 51,345,000 | 31,173,000 | 137,817,000 | 2,442,000 | 135,587,000 | 1,221,000 | 135,384,000 | 135,384,000 | 135,384,000 | 135,384,000 | |||||||||
| Net income (loss) per common unit (US$ per share) | $ 0.11 | $ 0.17 | $ 0.21 | $ 0.40 | $ 0.40 | $ 0.00 | $ 1.94 | $ 0.00 | $ 3.88 | $ (0.32) | $ (0.25) | $ (0.66) | $ (0.45) | ||||||||||
| Amortization of Beneficial Conversion Feature of Class B Units | $ 0 | $ 0 | $ (892) | $ (37,741) | $ (892) | $ 4,737 | $ 0 | $ 4,737 | $ (3,845) | $ (89,519) | $ (3,845) | $ (2,597) | |||||||||||