Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Beginning Balance	$ 1,052,653	$ 995,801
Net income (loss)	39,638	(21,201)
Other comprehensive income (loss)	19,459	3,889
Dividend reinvestment	55	63
Capital stock issued under employee benefit and stock plans	2,519	6,899
Purchase of capital stock	(55)	(63)
Cash dividends paid	(16,191)	(15,980)
Ending Balance	1,098,078	969,408
Capital stock [Member]
Beginning Balance	100,832	99,618
Dividend reinvestment	2	3
Capital stock issued under employee benefit and stock plans	376	290
Purchase of capital stock	(2)	(3)
Ending Balance	101,208	99,908
Additional paid-in capital [Member]
Beginning Balance	474,547	436,617
Dividend reinvestment	53	60
Capital stock issued under employee benefit and stock plans	2,143	6,609
Purchase of capital stock	(53)	(60)
Ending Balance	476,690	443,226
Retained earnings [Member]
Beginning Balance	765,607	780,597
Net income (loss)	39,183	(21,656)
Cash dividends paid	(16,191)	(15,980)
Ending Balance	788,599	742,961
Accumulated other comprehensive (loss) income [Member]
Beginning Balance	(323,692)	(352,509)
Other comprehensive income (loss)	19,175	3,474
Ending Balance	(304,517)	(349,035)
Non-controlling interest [Member]
Beginning Balance	35,359	31,478
Net income (loss)	455	455
Other comprehensive income (loss)	284	415
Cash dividends paid	0	0
Ending Balance	$ 36,098	$ 32,348