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Derivative Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Interest Rate Swap Contracts [Member]
Sep. 30, 2013
Interest Rate Swap Contracts [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Interest Expense [Member]
Sep. 30, 2012
Interest Rate Swap Contracts [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Interest Expense [Member]
Sep. 30, 2013
Interest Rate Swap Contracts [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Interest Expense [Member]
Sep. 30, 2012
Interest Rate Swap Contracts [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Interest Expense [Member]
Derivatives, Fair Value [Line Items]              
Interest rate swap contract term     5 years        
Fair value of derivative instrument [Abstract]              
Fair value of interest rate swap $ 0 $ 219          
Effect of interest rate swap contract accounted for derivative instrument on Consolidated Statements of Income [Abstract]              
Amount of Gain Recognized in Accumulated OCI (Effective Portion)       29 92 219 259
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)       $ 0 $ 96 $ 188 $ 289