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Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Noncontrolling Interests
Revenues		$ 483,545	$ 515,291	$ 876,325	$ 985,365
Net income attributable to noncontrolling interests		54		54	432
Tax effect on income recognized		2,340	$ 10,618	3,395	17,708
Blythe joint venture | Primary beneficiary
Noncontrolling Interests
Revenues		108		108	940
Net income attributable to noncontrolling interests		$ 54		54	432
Tax effect on income recognized				0
Distributions to non-controlling interests				0	1,515
Distributions from joint venture				0	$ 1,515
Capital contributions				$ 0		$ 0
Blythe joint venture | Primary beneficiary | Forecast
Noncontrolling Interests
Distributions to non-controlling interests	$ 59

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