Leases - Summary of Lease Income Types Relating to Lease Payments (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Leased Assets [Line Items]
Other rental income	$ 669,374	$ 639,620	$ 1,331,676	$ 1,272,451
Rental [Member]
Operating Leased Assets [Line Items]
Other rental income	$ 40,200		$ 78,500