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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 |  |  |  |  |  |

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