Derivative Financial Instruments (Details)		3 Months Ended	9 Months Ended
	May 22, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) instrument	Sep. 30, 2018 USD ($)
Derivative [Line Items]
Unrealized loss on derivatives during period		$ 1,536,000		$ 4,550,000
Interest Rate Swap
Derivative [Line Items]
Number of interest rate swap agreements | instrument			2
Derivative, notional amount			$ 44,300,000
Fixed interest rate on derivative			4.22%
Unrealized loss on derivatives during period			$ (2,800,000)
Derivative liability			$ 3,500,000
Ravenhall, Australia | Operating phase | Interest Rate Swap
Derivative [Line Items]
Fixed interest rate on derivative			4.20%
Ravenhall
Derivative [Line Items]
Amounts reclassified from other comprehensive income into earnings	$ 3,900,000