Consolidated Statements of Changes in Stockholder's 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, 2018	$ 654	$ 2,192,612	$ (1,201)	$ (89,898)	$ 39,102	$ 2,141,269
Balance (in shares) at Jun. 30, 2018	65,360,041
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances		3,527				3,527
Stock-based compensation and related share issuances (in shares)	40,263
Other				266		266
Distributions from (to) non-controlling interests		3,210			(428)	2,782
Net income and comprehensive income				67,368	(3,753)	63,615
Other comprehensive income (loss)			$ 1,201	(1,201)
Dividends declared				(51,098)		(51,098)
Balance at Mar. 31, 2019	$ 654	2,199,349		(74,563)	34,921	2,160,361
Balance (in shares) at Mar. 31, 2019	65,400,304
Balance at Dec. 31, 2018	$ 654	2,197,254		(86,238)	35,300	2,146,970
Balance (in shares) at Dec. 31, 2018	65,396,339
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances		1,675				1,675
Stock-based compensation and related share issuances (in shares)	3,965
Other				266		266
Distributions from (to) non-controlling interests		420			(201)	219
Net income and comprehensive income				28,772	(178)	28,594
Dividends declared				(17,363)		(17,363)
Balance at Mar. 31, 2019	$ 654	2,199,349		(74,563)	34,921	2,160,361
Balance (in shares) at Mar. 31, 2019	65,400,304
Balance at Jun. 30, 2019	$ 655	2,201,773		(65,747)	33,772	2,170,453
Balance (in shares) at Jun. 30, 2019	65,440,492
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances		4,025				4,025
Stock-based compensation and related share issuances (in shares)	71,756
Distributions from (to) non-controlling interests		3,300			(723)	2,577
Net income and comprehensive income				150,329	(2,750)	147,579
Dividends declared				(54,099)		(54,099)
Balance at Mar. 31, 2020	$ 655	2,209,098		30,483	30,299	2,270,535
Balance (in shares) at Mar. 31, 2020	65,512,248
Balance at Dec. 31, 2019	$ 655	2,205,364		10,290	30,905	2,247,214
Balance (in shares) at Dec. 31, 2019	65,496,004
Increase (Decrease) in Stockholders' Equity
Stock-based compensation and related share issuances		3,134				3,134
Stock-based compensation and related share issuances (in shares)	16,244
Distributions from (to) non-controlling interests		600			(344)	256
Net income and comprehensive income				38,554	(262)	38,292
Dividends declared				(18,361)		(18,361)
Balance at Mar. 31, 2020	$ 655	$ 2,209,098		$ 30,483	$ 30,299	$ 2,270,535
Balance (in shares) at Mar. 31, 2020	65,512,248