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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Beginning Balance $ 1,308,284 $ 1,163,948 $ 1,052,653 $ 1,230,327 $ 1,052,653
Net income 70,128 53,111 134,907 184,798 134,907
Other comprehensive income (loss) 1,026 19,992   (14,013) 55,041
Dividend reinvestment 54 54   161 163
Capital stock issued under employee benefit and stock plans 2,287 6,649   13,433 33,555
Purchase of capital stock (54) (54)   (161) (163)
Noncontrolling Interest, Increase from Business Combination 443     443  
Cash dividends (16,763) (17,546)   (49,583) (50,002)
Ending Balance 1,365,405 1,226,154 1,163,948 1,365,405 1,226,154
Capital stock [Member]          
Beginning Balance 102,700 101,897 100,832 102,058 100,832
Dividend reinvestment 2 2   5 5
Capital stock issued under employee benefit and stock plans 258 135   900 1,200
Purchase of capital stock (2) (2)   (5) (5)
Ending Balance 102,958 102,032 101,897 102,958 102,032
Additional paid-in capital [Member]          
Beginning Balance 522,413 500,388 474,547 511,909 474,547
Dividend reinvestment 52 52   156 158
Capital stock issued under employee benefit and stock plans 2,029 6,514   12,533 32,355
Purchase of capital stock (52) (52)   (156) (158)
Ending Balance 524,442 506,902 500,388 524,442 506,902
Retained earnings [Member]          
Beginning Balance 979,259 813,936 765,607 900,683 765,607
Net income 68,550 50,866   179,946 131,651
Cash dividends (16,448) (16,317)   (49,268) (48,773)
Ending Balance 1,031,361 848,485 813,936 1,031,361 848,485
Accumulated other comprehensive loss [Member]          
Beginning Balance (334,632) (289,816) (323,692) (320,325) (323,692)
Other comprehensive income (loss) 992 19,722   (13,315) 53,598
Ending Balance (333,640) (270,094) (289,816) (333,640) (270,094)
Non-controlling interest [Member]          
Beginning Balance 38,544 37,543 35,359 36,002 35,359
Net income 1,578 2,245   4,852 3,256
Other comprehensive income (loss) 34 270   (698) 1,443
Noncontrolling Interest, Increase from Business Combination 443     443  
Cash dividends (315) (1,229)   (315) (1,229)
Ending Balance $ 40,284 $ 38,829 $ 37,543 $ 40,284 $ 38,829