Derivative and Other Fair Value Instruments - Summary of Effect of Fair Value Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	$ (1,491)	$ (1,413)
Amount of Gain/(Loss) Recognized in Income on Hedged Item	1,491	1,413
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in Income on Derivative	(1,491)	(1,413)
Amount of Gain/(Loss) Recognized in Income on Hedged Item	$ 1,491	$ 1,413