Derivative Financial Instruments - Effect of Derivative Financial Instruments on Income Statement (Details) - Interest rate contracts - Derivatives designated as hedging instruments - Interest Expense - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)	$ (104)		$ (247)
Amount of Gain (Loss) Reclassed from Other Comprehensive Income into Income (Effective Portion)		$ (93)		$ (368)