Derivatives  Summary of Outstanding Swaps (Details) (USD $)

3 Months Ended  

Sep. 30, 2014


1.884 % interest rate swaps


Derivatives  
Notional  $ 536,250,000  
Rate Paid  1.884%  ^{[1]}  
Variable interest rate base floor  1.00%  
Variable interest rate base  3 mo.USDLIBORBBA  ^{[1]}  
1.384 % interest rate swaps


Derivatives  
Notional  142,100,000  
Rate Paid  1.384%  ^{[1]}  
Variable interest rate base floor  1.00%  
Variable interest rate base  3 mo.USDLIBORBBA  ^{[1]}  
1.959 % interest rate swaps


Derivatives  
Notional  111,086,683  
Rate Paid  1.959%  
Variable interest rate base floor  1.00%  
Variable interest rate base  3 mo.USDLIBORBBA  
1.850 % interest rate swaps


Derivatives  
Notional  $ 111,086,683  
Rate Paid  1.85%  
Variable interest rate base floor  1.00%  
Variable interest rate base  3 mo.USDLIBORBBA  
