v3.8.0.1
Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Beginning Balance     $ 1,052,653 $ 995,801
Net income (loss) $ 42,158 $ 7,915 81,796 (13,286)
Other comprehensive income (loss) 15,589 (34,173) 35,049 (30,284)
Dividend reinvestment     109 127
Capital stock issued under employee benefit and stock plans     26,906 14,492
Purchase of capital stock     (109) (127)
Cash dividends paid     (32,456) (32,042)
Ending Balance 1,163,948 934,681 1,163,948 934,681
Capital stock [Member]        
Beginning Balance     100,832 99,618
Dividend reinvestment     3 5
Capital stock issued under employee benefit and stock plans     1,065 464
Purchase of capital stock     (3) (5)
Ending Balance 101,897 100,082 101,897 100,082
Additional paid-in capital [Member]        
Beginning Balance     474,547 436,617
Dividend reinvestment     106 122
Capital stock issued under employee benefit and stock plans     25,841 14,028
Purchase of capital stock     (106) (122)
Ending Balance 500,388 450,645 500,388 450,645
Retained earnings [Member]        
Beginning Balance     765,607 780,597
Net income (loss)     80,785 (14,394)
Cash dividends paid     (32,456) (31,970)
Ending Balance 813,936 734,233 813,936 734,233
Accumulated other comprehensive (loss) income [Member]        
Beginning Balance     (323,692) (352,509)
Other comprehensive income (loss)     33,876 (29,645)
Ending Balance (289,816) (382,154) (289,816) (382,154)
Non-controlling interest [Member]        
Beginning Balance     35,359 31,478
Net income (loss)     1,011 1,108
Other comprehensive income (loss)     1,173 (639)
Cash dividends paid     0 (72)
Ending Balance $ 37,543 $ 31,875 $ 37,543 $ 31,875