Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Derivative Instruments and Hedging Activities - Effects on statements of income and consolidated statements of comprehensive income (Details) - Interest Rate Swap - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Designated as Hedging Instrument      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain Recognized in Net Income (Loss) $ (368) $ (1,418) $ (1,193)
Not Designated as Hedging Instrument      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain Recognized in Net Income (Loss) $ 0 $ 0 $ (266)