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New accounting pronouncements Adoption of ASU 2015-03 (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jun. 30, 2016
Adoption of ASU 2015-03    
Other assets $ 832,507 $ 827,492
Notes payable and long-term debt payable within one year 581,487 361,787
Long-term debt $ 2,653,560 2,652,457
As Previously Reported    
Adoption of ASU 2015-03    
Other assets   850,088
Notes payable and long-term debt payable within one year   361,840
Long-term debt   $ 2,675,000