Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated (Losses) Earnings	Noncontrolling Interests	Total
Balance at Jun. 30, 2015	$ 650	$ 2,170,643	$ (3,292)	$ 185,121	$ 62,805	$ 2,415,927
Balance (in shares) at Jun. 30, 2015	65,033,547
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances	$ 1	9,138				9,139
Stock-based compensation and related share issuances (in shares)	60,403
Net income (loss)				(77,149)	(5,289)	(82,438)
Other comprehensive income (loss)			3,292			3,292
Distributions to non-controlling interests					(647)	(647)
Dividends declared				(59,388)		(59,388)
Balance at Jun. 30, 2016	$ 651	2,179,781		48,584	56,869	2,285,885
Balance (in shares) at Jun. 30, 2016	65,093,950
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances	$ 1	8,533				8,534
Stock-based compensation and related share issuances (in shares)	85,577
Non-controlling interest assignment		(2,518)				(2,518)
Net income (loss)				101,530	(9,105)	92,425
Other comprehensive income (loss)			879			879
Distributions to non-controlling interests					(2,877)	(2,877)
Dividends declared				(62,064)		(62,064)
Balance at Jun. 30, 2017	$ 652	2,185,796	879	88,050	44,887	2,320,264
Balance (in shares) at Jun. 30, 2017	65,179,527
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances	$ 2	4,236				4,238
Stock-based compensation and related share issuances (in shares)	180,514
Contributions from non-controlling interests		2,580			432	3,012
Net income (loss)				(113,134)	(6,217)	(119,351)
Other comprehensive income (loss)			(2,080)			(2,080)
Dividends declared				(64,814)		(64,814)
Balance at Jun. 30, 2018	$ 654	$ 2,192,612	$ (1,201)	$ (89,898)	$ 39,102	$ 2,141,269
Balance (in shares) at Jun. 30, 2018	65,360,041