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Debt (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Line of Credit Facility [Line Items]    
Borrowing Capacity, Future Periods $ 850,000  
Short-term debt 14,384 37,575
Long-term debt 433,486 [1] 410,484 [1]
Debt, Carrying Value 447,870 448,059
Description of variable rate basis LIBOR  
Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 25,000  
Short-term debt 6,500 21,200
Basis spread on LIBOR 1.20%  
Weighted average interest rate 1.32%  
Short-term Debt [Member]
    
Line of Credit Facility [Line Items]    
Debt Instrument, Unamortized Discount 116  
Term Loan [Domain]
    
Line of Credit Facility [Line Items]    
Long-term Debt, Gross 160,000  
Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Current borrowing capacity 850,000  
Current portion of long-term debt 7,884 [1] 16,375 [1]
Senior unsecured revolving credit facility [Member]
    
Line of Credit Facility [Line Items]    
Weighted average interest rate 2.18%  
Senior unsecured revolving credit facility [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on LIBOR 1.50%  
Commitment fee (percentage) 0.225%  
Senior leverage ratio, current year 1.00  
Interest coverage ratio 100.00%  
Senior unsecured revolving credit facility [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Basis spread on LIBOR 2.25%  
Commitment fee (percentage) 0.40%  
Senior leverage ratio, current year 4.50  
Interest coverage ratio 300.00%  
Secured Debt [Member] | Minimum [Member]
    
Line of Credit Facility [Line Items]    
Senior leverage ratio, current year 1.00  
Secured Debt [Member] | Maximum [Member]
    
Line of Credit Facility [Line Items]    
Senior leverage ratio, current year 3.25  
Long-term Debt [Member]
    
Line of Credit Facility [Line Items]    
Debt Instrument, Unamortized Discount 464  
Revolving Loan, Maturity September 23, 2019 [Member] | Line of Credit [Member]
    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 690,000  
[1] (1) Balances as of September 30, 2014 are inclusive of short-term and long-term debt discounts of $116 and $464, respectively.