Derivative Financial Instruments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 867,000
Swap [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 7,400,000