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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Beginning Balance     $ 995,801 $ 1,375,435
Net loss $ 7,915 $ (168,811) (13,286) (174,514)
Other comprehensive income (34,173) (4,099) (30,284) (21,971)
Dividend reinvestment     127 167
Capital stock issued under employee benefit and stock plans     14,492 7,243
Purchase of capital stock     (127) (167)
Cash dividends paid     (32,042) (31,916)
Ending Balance 934,681 1,154,277 934,681 1,154,277
Capital stock [Member]        
Beginning Balance     99,618 99,219
Dividend reinvestment     5 8
Capital stock issued under employee benefit and stock plans     464 369
Purchase of capital stock     (5) (8)
Ending Balance 100,082 99,588 100,082 99,588
Additional paid-in capital [Member]        
Beginning Balance     436,617 419,829
Dividend reinvestment     122 159
Capital stock issued under employee benefit and stock plans     14,028 6,874
Purchase of capital stock     (122) (159)
Ending Balance 450,645 426,703 450,645 426,703
Retained earnings [Member]        
Beginning Balance     780,597 1,070,282
Net loss     (14,394) (175,453)
Cash dividends paid     (31,970) (31,845)
Ending Balance 734,233 862,984 734,233 862,984
Accumulated other comprehensive (loss) income [Member]        
Beginning Balance     (352,509) (243,523)
Other comprehensive income     (29,645) (20,904)
Ending Balance (382,154) (264,427) (382,154) (264,427)
Non-controlling interest [Member]        
Beginning Balance     31,478 29,628
Net loss     1,108 939
Other comprehensive income     (639) (1,067)
Cash dividends paid     (72) (71)
Ending Balance $ 31,875 $ 29,429 $ 31,875 $ 29,429