Derivative Financial Instruments Narrative (Details)	Feb. 28, 2020 USD ($)	Nov. 30, 2015 USD ($)	Sep. 30, 2020 USD ($) contracts	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)
Net unrealized loss on hedging instruments			$ 154,013,000		$ 204,672,000
Total debt			1,350,156,000
Secured Debt [Member]
Total debt			1,350,156,000		$ 950,156,000
Net Unrealized Gain (Loss) on Nonderivative Instruments
Net unrealized loss on hedging instruments			$ 14,400,000			$ 14,400,000
Number of Counterparties [Member]
Derivative counterparties			4		5
Interest Rate Swap [Member]
Number of interest rate derivatives held									1
Derivative, notional amount				$ 240,000,000					$ 214,000,000
Derivative, fixed interest rate				0.617%					1.42%
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net			$ 1,000,000.0
Interest Rate Cap [Member]
Number of interest rate derivatives held		3
Derivative, notional amount		$ 100,000,000						$ 100,000,000
Derivative purchase price		$ 1,700,000
Derivative, cap interest rate		2.00%
Currency Swap [Member]
Number of interest rate derivatives held							1
Derivative, notional amount							$ 56,000,000.0
Derivative, fixed interest rate							1.38%
Foreign currency cash flow hedge gain (loss) to be reclassified during next 12 months			$ 1,700,000
Foreign Exchange Option [Member]
Derivative, notional amount	$ 96,000,000
Derivative purchase price	$ 1,200,000
Forward Contracts [Member]
Number of foreign exchange contracts | contracts			43
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]
Derivative, notional amount			$ 102,000
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]
Derivative, notional amount			26,400,000
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member]
Total debt			$ 950,200,000