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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Sales Revenue, Services, Net $ 364,417 $ 314,155 $ 342,880 $ 321,683 $ 344,358 $ 381,516 $ 310,998 $ 226,217 $ 1,343,135 $ 1,263,089 $ 892,574
Gross Profit 40,404 2,632 15,955 28,379 36,903 39,944 34,150 25,476 87,370 136,473 94,702
Operating income 18,374 (14,448) (3,671) 8,547 14,209 18,819 14,817 10,762 8,802 58,607 36,714
Net income $ 10,916 $ (2,959) $ 3,286 $ 5,914 $ 7,556 $ 11,396 $ 10,306 $ 6,552 $ 17,157 $ 35,810 $ 24,008
Basic earnings per common share (in dollars per share) $ 0.41 $ (0.11) $ 0.12 $ 0.22 $ 0.29 $ 0.43 $ 0.39 $ 0.25 $ 0.64 $ 1.36 $ 0.92
Diluted earnings per common share (in dollars per share) $ 0.40 $ (0.11) $ 0.12 $ 0.22 $ 0.28 $ 0.42 $ 0.38 $ 0.25 $ 0.63 $ 1.33 $ 0.91