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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Beginning Balance     $ 995,801 $ 1,375,435
Net income (loss) $ 39,654 $ 16,695 26,368 (157,820)
Other comprehensive income (loss) 14,387 15,775 (15,898) (6,196)
Dividend reinvestment     188 231
Capital stock issued under employee benefit and stock plans     21,385 11,243
Purchase of capital stock     (188) (231)
Cash dividends paid     (48,085) (47,851)
Ending Balance 979,571 1,174,811 979,571 1,174,811
Capital stock [Member]        
Beginning Balance     99,618 99,219
Dividend reinvestment     7 12
Capital stock issued under employee benefit and stock plans     697 380
Purchase of capital stock     (7) (12)
Ending Balance 100,315 99,599 100,315 99,599
Additional paid-in capital [Member]        
Beginning Balance     436,617 419,829
Dividend reinvestment     181 219
Capital stock issued under employee benefit and stock plans     20,688 10,863
Purchase of capital stock     (181) (219)
Ending Balance 457,305 430,692 457,305 430,692
Retained earnings [Member]        
Beginning Balance     780,597 1,070,282
Net income (loss)     24,495 (159,454)
Cash dividends paid     (48,013) (47,780)
Ending Balance 757,079 863,048 757,079 863,048
Accumulated other comprehensive (loss) income [Member]        
Beginning Balance     (352,509) (243,523)
Other comprehensive income (loss)     (16,228) (5,656)
Ending Balance (368,737) (249,179) (368,737) (249,179)
Non-controlling interest [Member]        
Beginning Balance     31,478 29,628
Net income (loss)     1,873 1,634
Other comprehensive income (loss)     330 (540)
Cash dividends paid     (72) (71)
Ending Balance $ 33,609 $ 30,651 $ 33,609 $ 30,651