Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities- Effects on statements of income and consolidated statements of comprehensive income (Details)

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Derivative Instruments and Hedging Activities- Effects on statements of income and consolidated statements of comprehensive income (Details) (Interest rate swap instruments, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivatives Designated as Hedging Instruments:
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in (Loss) Income $ (69) $ (125) $ (1,266) $ (1,112)
Not Designated as Hedging Instrument
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in (Loss) Income $ 0 $ 0 $ 0 $ (266)