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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 293,087	$ 245,645	$ 282,911	$ 269,910	$ 291,836	$ 251,237	$ 312,655	$ 341,781	$ 1,091,553	$ 1,197,509	$ 1,311,917
Gross profit (loss)	21,451	14,891	26,703	28,891	23,127	(2,614)	28,212	32,278	91,936	81,003	125,991
Operating income (loss)	(17,112)	(5,862)	5,174	7,321	3,531	(21,210)	8,237	14,301	(10,479)	4,859	40,882
Net income (loss)	$ (14,683)	$ (5,153)	$ 4,532	$ 3,824	$ (954)	$ (13,821)	$ 5,250	$ 9,342	$ (11,480)	$ (183)	$ 28,863
Basic earnings (loss) per common share (in dollars per share)	$ (0.55)	$ (0.19)	$ 0.17	$ 0.14	$ (0.04)	$ (0.52)	$ 0.20	$ 0.35	$ (0.43)	$ (0.01)	$ 1.09
Diluted earnings (loss) per common share (in dollars per share)	$ (0.55)	$ (0.19)	$ 0.17	$ 0.14	$ (0.04)	$ (0.52)	$ 0.20	$ 0.35	$ (0.43)	$ (0.01)	$ 1.07

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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