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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Beginning Balance     $ 1,230,327 $ 1,052,653
Net income $ 56,247 $ 42,158 114,670 81,796
Other comprehensive income (loss) (799) 15,589 (15,039) 35,049
Dividend reinvestment     107 109
Capital stock issued under employee benefit and stock plans     11,146 26,906
Purchase of capital stock     (107) (109)
Cash dividends     (32,820) (32,456)
Ending Balance 1,308,284 1,163,948 1,308,284 1,163,948
Capital stock [Member]        
Beginning Balance     102,058 100,832
Dividend reinvestment     3 3
Capital stock issued under employee benefit and stock plans     642 1,065
Purchase of capital stock     (3) (3)
Ending Balance 102,700 101,897 102,700 101,897
Additional paid-in capital [Member]        
Beginning Balance     511,909 474,547
Dividend reinvestment     104 106
Capital stock issued under employee benefit and stock plans     10,504 25,841
Purchase of capital stock     (104) (106)
Ending Balance 522,413 500,388 522,413 500,388
Retained earnings [Member]        
Beginning Balance     900,683 765,607
Net income     111,396 80,785
Cash dividends     (32,820) (32,456)
Ending Balance 979,259 813,936 979,259 813,936
Accumulated other comprehensive loss [Member]        
Beginning Balance     (320,325) (323,692)
Other comprehensive income (loss)     (14,307) 33,876
Ending Balance (334,632) (289,816) (334,632) (289,816)
Non-controlling interest [Member]        
Beginning Balance     36,002 35,359
Net income     3,274 1,011
Other comprehensive income (loss)     (732) 1,173
Cash dividends     0 0
Ending Balance $ 38,544 $ 37,543 $ 38,544 $ 37,543