Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Mar. 11, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Notional Amount		$ 647,326			$ 647,326		$ 513,208
Unrealized cash flow hedge losses		(3,459)	$ (1,003)	$ 0	(4,462)	$ 0
Realized cash flow hedge losses reclassified to net income		35	$ 72	$ 0	107	$ 0
Gain (loss) reclassified during next 12 months		(1,100)			(1,100)
Interest Rate Swaps
Derivative [Line Items]
Notional Amount		247,326			247,326
Not designated as accounting hedges
Derivative [Line Items]
Notional Amount		500,000			500,000		450,000
Not designated as accounting hedges | Interest Rate Swaps
Derivative [Line Items]
Notional Amount		100,000			$ 100,000		$ 100,000
Line of credit | Secured Debt | Lightfoot Marketplace
Derivative [Line Items]
Proceeds from lines of credit	$ 7,400
Maximum
Derivative [Line Items]
Realized cash flow hedge losses reclassified to net income		$ 100