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Debt (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 6 Months Ended
Dec. 31, 2013
Jan. 17, 2014
Jun. 30, 2013
Jan. 17, 2014
Term Loan [Domain]
Dec. 31, 2013
Term Loan [Domain]
Jan. 17, 2014
Line of Credit [Member]
Dec. 31, 2013
Line of Credit [Member]
Dec. 31, 2013
Senior unsecured revolving credit facility [Member]
Dec. 31, 2013
Senior unsecured revolving credit facility [Member]
Minimum [Member]
Dec. 31, 2013
Senior unsecured revolving credit facility [Member]
Maximum [Member]
Feb. 08, 2013
Revolving Loan, Maturity Date of February 8, 2018 [Member]
Line of Credit [Member]
Line of Credit Facility [Line Items]                      
Long-term Debt $ 204,500   $ 238,750                
Current borrowing capacity             496,250        
Maximum borrowing capacity                     400,000
Long-term Debt, Gross         96,250            
Long-term debt 189,250   230,000                
Description of variable rate basis LIBOR                    
Basis spread on LIBOR                 1.50% 2.00%  
Weighted average interest rate               2.03%      
Commitment fee (percentage)                 0.225% 0.35%  
Senior leverage ratio, current year               3.5      
Senior leverage ratio, next calendar year               3.25      
Senior leverage ratio, year three               3.0      
Ratio of earnings before interest, taxes, depreciation and amortization to interest expense               3.0      
Line Of Credit Facility, Increase To Borrowing Capacity In Future Periods   303,750                  
Borrowing Capacity, Future Periods   $ 800,000   $ 160,000   $ 640,000