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Derivatives (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
2011 Interest Rate Swap
Dec. 31, 2013
2011 Interest Rate Swap
Derivative [Line Items]            
Notional amount of interest rate derivatives         $ 93.5  
Fixed rate payments, interest rate         5.50% 5.50%
Variable rate payment rate         1.75% 1.75%
Fair value of collateral pledged to secure interest rate contracts 7.0   7.0      
Incremental interest expense paid to interest rate swap counterparties $ 0.8 $ 0.8 $ 1.7 $ 1.6