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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Alpine Helicopters [Member]    
Principles of Consolidation [Abstract]    
Ownership interest in VIE 20.00%  
Percentage of helicopters leased from consolidated subsidiary 100.00%  
Noncontrolling interest held by employees 80.00%  
Total assets $ 12,000  
Total liabilities 5,100  
Carrying Value [Member] | Senior Debt [Member]    
Fair Value of Financial Instruments [Abstract]    
Long-term debt 554,480 $ 554,480
Carrying Value [Member] | Other Debt Obligations [Member]    
Fair Value of Financial Instruments [Abstract]    
Long-term debt 1,141 1,172
Fair Value [Member] | Senior Debt [Member]    
Fair Value of Financial Instruments [Abstract]    
Long-term debt 558,812 555,173
Fair Value [Member] | Other Debt Obligations [Member]    
Fair Value of Financial Instruments [Abstract]    
Long-term debt $ 949 $ 971