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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 398,714 $ 358,887 $ 340,568 $ 318,511 $ 293,087 $ 245,645 $ 282,911 $ 269,910 $ 1,416,680 $ 1,091,553 $ 1,197,509
Gross profit (loss) 43,738 36,906 27,886 23,421 21,451 14,891 26,703 28,891 131,951 91,936 81,003
Operating income (loss) 17,389 12,794 5,527 2,220 (17,112) (5,862) 5,174 7,321 37,930 (10,479) 4,859
Net income (loss) $ 12,812 $ 8,933 $ 3,932 $ 2,305 $ (14,683) $ (5,153) $ 4,532 $ 3,824 $ 27,982 $ (11,480) $ (183)
Basic earnings (loss) per common share $ 0.48 $ 0.33 $ 0.15 $ 0.09 $ (0.55) $ (0.19) $ 0.17 $ 0.14 $ 1.04 $ (0.43) $ (0.01)
Diluted earnings (loss) per common share $ 0.47 $ 0.33 $ 0.14 $ 0.08 $ (0.55) $ (0.19) $ 0.17 $ 0.14 $ 1.01 $ (0.43) $ (0.01)