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Segment Information (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Quarterly Financial Data                      
Revenues $ 184,862 $ 183,899 $ 200,964 $ 169,321 $ 163,629 $ 136,333 $ 175,252 $ 151,838 $ 739,046 $ 627,052 $ 550,814
Gross profit 18,656 19,771 23,098 18,093 20,874 18,570 19,768 15,702 79,618 74,914 52,922
Operating income (loss) 6,410 7,415 11,200 6,610 9,515 7,640 8,632 5,113 31,635 30,900 7,753
Net income $ 1,786 $ 4,862 $ 7,031 $ 3,509 $ 5,683 $ 4,923 $ 5,287 $ 3,089 $ 17,188 $ 18,982 $ 4,876
Earnings (loss) per common share:                      
Basic earnings per common share $ 0.07 $ 0.19 $ 0.27 $ 0.13 $ 0.21 $ 0.19 $ 0.20 $ 0.12 $ 0.66 $ 0.72 $ 0.19
Diluted earnings per common share $ 0.07 $ 0.19 $ 0.27 $ 0.13 $ 0.21 $ 0.18 $ 0.20 $ 0.12 $ 0.65 $ 0.71 $ 0.18