Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Narrative) (Details)

v2.4.0.8
Derivative Instruments (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Interest Rate Swap [Member]
interest_rate_derivative_held
Sep. 30, 2012
Maximum [Member]
Dec. 31, 2011
Interest Rate Swap Agreement 1 [Member]
Interest Rate Swap [Member]
Dec. 31, 2011
Interest Rate Swap Agreement 2 [Member]
Interest Rate Swap [Member]
Derivative [Line Items]                
Number of interest rate swaps held         2      
Fixed interest rate             1.67% 1.83%
Notional amount of interest rate derivatives         $ 31,800,000      
Fair value of derivative liabilities 700,000 700,000   1,000,000        
Derivative Instruments, Gain Recognized in Income 100,000 300,000            
Recognized losses less than amount     $ 500,000     $ 400,000