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Initial Public Offering (Summary of Net Income) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 24, 2012
Sep. 30, 2012
Sep. 30, 2012
Predecessor [Member]
Sep. 24, 2012
Predecessor [Member]
Sep. 30, 2011
Predecessor [Member]
Sep. 24, 2012
Predecessor [Member]
Sep. 30, 2011
Predecessor [Member]
Revenues $ 70,359 $ 1,109,616   $ 3,268,781   $ 1,039,257 $ 991,863 $ 3,198,422 $ 2,854,939
Cost of sales 69,462 1,096,787   3,231,890   1,027,325 980,327 3,162,428 2,822,380
Gross profit 897 12,829   36,891   11,932 11,536 35,994 32,559
Total operating expenses 295 7,359   22,791   7,064 6,534 22,496 18,952
Income from operations 602 5,470   14,100   4,868 5,002 13,498 13,607
Interest expense, net (24) (113)   (293)   (89) (87) (269) (246)
Income before income taxes 578 5,357   13,807   4,779 4,915 13,229 13,361
Income tax expense (4) (1,739)   (4,813)   (1,735) (1,778) (4,809) (4,837)
Net income and comprehensive income $ 574 $ 3,618 $ 8,420 $ 8,994 $ 0 $ 3,044 $ 3,137 $ 8,420 $ 8,524