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Summary of Significant Accounting Policies (Details 4) (Designated as hedges, CRNF, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Interest rate swap agreements
agreement
Jul. 01, 2011
Interest rate swap agreements
agreement
Dec. 31, 2012
Interest rate swap agreements entered into on June 30, 2011
D
Dec. 31, 2012
Interest rate swap agreements entered into on July 1, 2011
D
Derivative Financial Instruments        
Borrowing capacity $ 125.0      
Aggregate notional amount $ 62.5      
Average fixed rate of interest (as a percent) 1.96%      
Number of agreements 2 2    
Floating rate basis     Three months LIBOR Three months LIBOR
Fixed rate (as a percent)     1.94% 1.975%
Settlement period (in days)     90 90