Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Narrative) (Details)

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Derivative Financial Instruments (Narrative) (Details) (Cash Flow Hedging [Member], Designated as Hedging Instrument [Member], USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2005
Treasury Lock [Member]
derivative_agreement
Derivative [Line Items]      
Number of instruments held     2
Debt instrument, term     10 years
Proceeds from hedge, financing activities     $ 3,200,000
Unamortized balance of settled agreements 645,000 741,000  
Gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred $ 400,000