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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Sales Revenue, Services, Net $ 344,358 $ 381,516 $ 310,998 $ 226,217 $ 235,560 $ 225,970 $ 221,436 $ 209,608 $ 1,263,089 $ 892,574 $ 739,046
Gross Profit 36,903 39,944 34,150 25,476 26,999 23,126 22,333 22,244 136,473 94,702 79,618
Operating income 14,209 18,819 14,817 10,762 11,587 8,431 8,722 7,924 58,607 36,714 31,635
Net income $ 7,556 $ 11,396 $ 10,306 $ 6,552 $ 7,367 $ 6,521 $ 5,436 $ 4,684 $ 35,810 $ 24,008 $ 17,188
Basic earnings per common share (in dollars per share) $ 0.29 $ 0.43 $ 0.39 $ 0.25 $ 0.28 $ 0.25 $ 0.21 $ 0.18 $ 1.36 $ 0.92 $ 0.66
Diluted earnings per common share (in dollars per share) $ 0.28 $ 0.42 $ 0.38 $ 0.25 $ 0.28 $ 0.25 $ 0.21 $ 0.18 $ 1.33 $ 0.91 $ 0.65