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Derivative Financial Instruments (Details) (Interest rate swaps, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Derivative financial instruments  
Fair value of collateral posted $ 5.3
Counterparty A paying 1.67% interest
 
Derivative financial instruments  
Notional amount of interest rate derivative agreements 25.0
Derivative reference rate 3-Month LIBOR
Counterparty A paying 1.65% interest
 
Derivative financial instruments  
Notional amount of interest rate derivative agreements 25.0
Derivative reference rate 3-Month LIBOR
Counterparty B paying 1.59% interest
 
Derivative financial instruments  
Notional amount of interest rate derivative agreements 25.0
Derivative reference rate 3-Month LIBOR
Counterparty B paying 2.14% interest
 
Derivative financial instruments  
Notional amount of interest rate derivative agreements $ 25.0
Derivative reference rate 3-Month LIBOR