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Supplemental Information to Consolidated Combined Financial Statements (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Quarterly Financial Data—(in thousands, except per unit amounts)
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Year ended December 31, 2012:
 
 
 
 
 
 
 
 
Revenues
 
$
69,323

 
$
61,396

 
$
66,308

 
67,300

Income from operations
 
24,891

 
18,275

 
772

 
19,602

Net loss
 
(19,332
)
 
(24,861
)
 
(42,422
)
 
(63,521
)
Net income (loss) per common unit—basic and diluted
 
$
0.23

 
$
0.17

 
$
0.04

 
$
(0.06
)
 
 
 
 
 
 
 
 
 
Year ended December 31, 2011:
 
 

 
 

 
 

 
 

Revenues
 
$
74,450

 
$
73,609

 
$
64,907

 
$
70,824

Income from operations
 
41,127

 
36,932

 
29,523

 
37,044

Net loss
 
(2,209
)
 
(6,868
)
 
(14,479
)
 
(7,463
)
Net income per common unit—basic and diluted
 
$
0.35

 
$
0.32

 
$
0.29

 
$
0.30