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Financial instruments - Financial Assets & Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Jun. 30, 2016
Derivatives    
Liabilities:    
Derivative liability $ 9,600 $ 13,028
Derivatives | Quoted Prices In Active Markets (Level 1)    
Liabilities:    
Derivative liability 0 0
Derivatives | Significant Other Observable Inputs (Level 2)    
Liabilities:    
Derivative liability 9,600 13,028
Derivatives | Significant Unobservable Inputs (Level 3)    
Liabilities:    
Derivative liability 0 0
Equity securities    
Assets:    
Investments 2,302 1,296
Equity securities | Quoted Prices In Active Markets (Level 1)    
Assets:    
Investments 2,302 1,296
Equity securities | Significant Other Observable Inputs (Level 2)    
Assets:    
Investments 0 0
Equity securities | Significant Unobservable Inputs (Level 3)    
Assets:    
Investments 0 0
Government bonds    
Assets:    
Investments   15,764
Government bonds | Quoted Prices In Active Markets (Level 1)    
Assets:    
Investments   15,764
Government bonds | Significant Other Observable Inputs (Level 2)    
Assets:    
Investments   0
Government bonds | Significant Unobservable Inputs (Level 3)    
Assets:    
Investments   0
Corporate bonds    
Assets:    
Investments 5,587 184,380
Corporate bonds | Quoted Prices In Active Markets (Level 1)    
Assets:    
Investments 5,587 184,380
Corporate bonds | Significant Other Observable Inputs (Level 2)    
Assets:    
Investments 0 0
Corporate bonds | Significant Unobservable Inputs (Level 3)    
Assets:    
Investments 0 0
Asset-backed and mortgage-backed securities    
Assets:    
Investments 4,680 8,746
Asset-backed and mortgage-backed securities | Quoted Prices In Active Markets (Level 1)    
Assets:    
Investments 0 0
Asset-backed and mortgage-backed securities | Significant Other Observable Inputs (Level 2)    
Assets:    
Investments 4,680 8,746
Asset-backed and mortgage-backed securities | Significant Unobservable Inputs (Level 3)    
Assets:    
Investments 0 0
Derivatives    
Assets:    
Derivative asset 34,799 25,303
Derivatives | Quoted Prices In Active Markets (Level 1)    
Assets:    
Derivative asset 0 0
Derivatives | Significant Other Observable Inputs (Level 2)    
Assets:    
Derivative asset 34,799 25,303
Derivatives | Significant Unobservable Inputs (Level 3)    
Assets:    
Derivative asset 0 0
Investments measured at net asset value    
Assets:    
Investments $ 6,599 $ 361,770