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Initial Public Offering (Summary of Cash Flow) (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 25, 2012
Sep. 30, 2012
Sep. 24, 2012
Sep. 24, 2012
Predecessor [Member]
Sep. 30, 2011
Predecessor [Member]
Jul. 03, 2011
Predecessor [Member]
Cash flows from operating activities:              
Net cash provided by operating activities $ 16,761   $ 25,912   $ 9,151 $ 1,801  
Cash flows from investing activities:              
Purchase of intangibles and capital expenditures (48)   (9,854)   (9,806)    
Purchase of short-term investments (259,654)   (259,654)   0 0  
Redemption of short term investments 78,976   78,976   0 0  
Proceeds from disposal of property and equipment 0   754   754 46  
Net cash used in investing activities (180,726)   (189,778)   (9,052) (6,364)  
Cash flows from financing activities:              
Change in notes receivable 0   32   32 186  
Proceeds from issuance of long-term debt 180,666 181,000 180,666   0 0  
Loan origination costs (1,891)   (1,891)     0  
Proceeds from issuance of common units, net of offering costs 206,030 206,000 206,030   0 0  
Distributions to Parent (206,030)   (206,030)   0 0  
Predecessor cash retained by Parent 0   (354)   (354) 0  
Payments on long-term debt 0   (17)   (17) (16)  
Net cash provided by financing activities 178,775   178,436   (339) 170  
Net increase (decrease) in cash 14,810   14,570   (240) (4,393)  
Cash and cash equivalents at beginning of year     240 0 240 4,749 356
Cash and cash equivalents at end of period $ 14,810   $ 14,810 $ 0 $ 0   $ 356